Replace backticks with RDoc markup [ci-skip]

RDoc does not support backticks the way that Markdown does.  Instead,
inline code must be wrapped with `+` or `<tt>`.

actionpack/lib/action_controller/metal/redirecting.rb

@@ -74,7 +74,7 @@ class UnsafeRedirectError < StandardError; end
     #
     # Raises UnsafeRedirectError in the case of an unsafe redirect.
     #
-    # To allow any external redirects pass `allow_other_host: true`, though using a user-provided param in that case is unsafe.
+    # To allow any external redirects pass <tt>allow_other_host: true</tt>, though using a user-provided param in that case is unsafe.
     #
     #   redirect_to "https://rubyonrails.org", allow_other_host: true
     #

actionpack/lib/action_controller/metal/strong_parameters.rb

@@ -236,7 +236,7 @@ class Parameters
     # By default, never raise an UnpermittedParameters exception if these
     # params are present. The default includes both 'controller' and 'action'
     # because they are added by Rails and should be of no concern. One way
-    # to change these is to specify `always_permitted_parameters` in your
+    # to change these is to specify +always_permitted_parameters+ in your
     # config. For instance:
     #
     #    config.action_controller.always_permitted_parameters = %w( controller action format )

actionview/lib/action_view/helpers/form_options_helper.rb

@@ -598,7 +598,7 @@ def time_zone_options_for_select(selected = nil, priority_zones = nil, model = :
       #
       # Options:
       # * <tt>:index_as_value</tt> - Defaults to false, set to true to use the indexes from
-      # `I18n.translate("date.day_names")` as the values. By default, Sunday is always 0.
+      # <tt>I18n.translate("date.day_names")</tt> as the values. By default, Sunday is always 0.
       # * <tt>:day_format</tt> - The I18n key of the array to use for the weekday options.
       # Defaults to :day_names, set to :abbr_day_names for abbreviations.
       # * <tt>:beginning_of_week</tt> - Defaults to Date.beginning_of_week.

actionview/lib/action_view/helpers/tag_helper.rb

@@ -240,7 +240,7 @@ def method_missing(called, *args, **options, &block)
       # Transforms a Hash into HTML attributes, ready to be interpolated into
       # ERB. Includes or omits boolean attributes based on their truthiness.
       # Transforms keys nested within
-      # <tt>aria:</tt> or <tt>data:</tt> objects into `aria-` and `data-`
+      # <tt>aria:</tt> or <tt>data:</tt> objects into <tt>aria-</tt> and <tt>data-</tt>
       # prefixed attributes:
       #
       #   <input <%= tag.attributes(type: :text, aria: { label: "Search" }) %>>

activerecord/lib/active_record/associations.rb

@@ -1416,8 +1416,8 @@ module ClassMethods
         # [:disable_joins]
         #   Specifies whether joins should be skipped for an association. If set to true, two or more queries
         #   will be generated. Note that in some cases, if order or limit is applied, it will be done in-memory
-        #   due to database limitations. This option is only applicable on `has_many :through` associations as
-        #   `has_many` alone do not perform a join.
+        #   due to database limitations. This option is only applicable on <tt>has_many :through</tt> associations as
+        #   +has_many+ alone do not perform a join.
         # [:source]
         #   Specifies the source association name used by #has_many <tt>:through</tt> queries.
         #   Only use it if the name cannot be inferred from the association.
@@ -1581,8 +1581,8 @@ def has_many(name, scope = nil, **options, &extension)
         # [:disable_joins]
         #   Specifies whether joins should be skipped for an association. If set to true, two or more queries
         #   will be generated. Note that in some cases, if order or limit is applied, it will be done in-memory
-        #   due to database limitations. This option is only applicable on `has_one :through` associations as
-        #   `has_one` alone does not perform a join.
+        #   due to database limitations. This option is only applicable on <tt>has_one :through</tt> associations as
+        #   +has_one+ alone does not perform a join.
         # [:source]
         #   Specifies the source association name used by #has_one <tt>:through</tt> queries.
         #   Only use it if the name cannot be inferred from the association.

activerecord/lib/active_record/connection_adapters/abstract_adapter.rb

@@ -241,13 +241,13 @@ def connection_class # :nodoc:
       end
 
       # The role (e.g. +:writing+) for the current connection. In a
-      # non-multi role application, `:writing` is returned.
+      # non-multi role application, +:writing+ is returned.
       def role
         @pool.role
       end
 
       # The shard (e.g. +:default+) for the current connection. In
-      # a non-sharded application, `:default` is returned.
+      # a non-sharded application, +:default+ is returned.
       def shard
         @pool.shard
       end

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -104,7 +104,7 @@ def new_client(conn_params)
 
       ##
       # :singleton-method:
-      # PostgreSQL supports multiple types for DateTimes. By default, if you use `datetime`
+      # PostgreSQL supports multiple types for DateTimes. By default, if you use +datetime+
       # in migrations, Rails will translate this to a PostgreSQL "timestamp without time zone".
       # Change this in an initializer to use another NATIVE_DATABASE_TYPES. For example, to
       # store DateTimes as "timestamp with time zone":

activerecord/lib/active_record/core.rb

@@ -60,7 +60,7 @@ def self.configurations
       ##
       # :singleton-method:
       # Force enumeration of all columns in SELECT statements.
-      # e.g. `SELECT first_name, last_name FROM ...` instead of `SELECT * FROM ...`
+      # e.g. <tt>SELECT first_name, last_name FROM ...</tt> instead of <tt>SELECT * FROM ...</tt>
       # This avoids +PreparedStatementCacheExpired+ errors when a column is added
       # to the database while the app is running.
       class_attribute :enumerate_columns_in_select_statements, instance_accessor: false, default: false

activerecord/lib/active_record/encryption/encryptable_record.rb

@@ -23,7 +23,7 @@ module EncryptableRecord
         # * <tt>:key</tt> - A password to derive the key from. It's a shorthand for a +:key_provider+ that
         #   serves derivated keys. Both options can't be used at the same time.
         # * <tt>:key_provider</tt> - Set a +:key_provider+ to provide encryption and decryption keys. If not
-        #   provided, it will default to the key provider set with `config.key_provider`.
+        #   provided, it will default to the key provider set with +config.key_provider+.
         # * <tt>:deterministic</tt> - By default, encryption is not deterministic. It will use a random
         #   initialization vector for each encryption operation. This means that encrypting the same content
         #   with the same key twice will generate different ciphertexts. When set to +true+, it will generate the

activerecord/lib/active_record/encryption/envelope_encryption_key_provider.rb

@@ -10,7 +10,7 @@ module Encryption
     #
     # This provider can work with multiple master keys. It will use the last one for encrypting.
     #
-    # When `config.store_key_references` is true, it will also store a reference to
+    # When +config.store_key_references+ is true, it will also store a reference to
     # the specific master key that was used to encrypt the data-encryption key. When not set,
     # it will try all the configured master keys looking for the right one, in order to
     # return the right decryption key.

activerecord/lib/active_record/middleware/shard_selector.rb

@@ -7,11 +7,11 @@ module Middleware
     # shard to switch to and allows for applications to write custom strategies
     # for swapping if needed.
     #
-    # The ShardSelector takes a set of options (currently only `lock` is supported)
-    # that can be used by the middleware to alter behavior. `lock` is
+    # The ShardSelector takes a set of options (currently only +lock+ is supported)
+    # that can be used by the middleware to alter behavior. +lock+ is
     # true by default and will prohibit the request from switching shards once
-    # inside the block. If `lock` is false, then shard swapping will be allowed.
-    # For tenant based sharding, `lock` should always be true to prevent application
+    # inside the block. If +lock+ is false, then shard swapping will be allowed.
+    # For tenant based sharding, +lock+ should always be true to prevent application
     # code from mistakenly switching between tenants.
     #
     # Options can be set in the config:

activestorage/app/models/active_storage/variant_with_record.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 # Like an ActiveStorage::Variant, but keeps detail about the variant in the database as an
-# ActiveStorage::VariantRecord. This is only used if `ActiveStorage.track_variants` is enabled.
+# ActiveStorage::VariantRecord. This is only used if +ActiveStorage.track_variants+ is enabled.
 class ActiveStorage::VariantWithRecord
   attr_reader :blob, :variation
   delegate :service, to: :blob

activesupport/lib/active_support/core_ext/date_and_time/compatibility.rb

@@ -15,7 +15,7 @@ module Compatibility
 
     # Change the output of <tt>ActiveSupport::TimeZone.utc_to_local</tt>.
     #
-    # When `true`, it returns local times with a UTC offset, with `false` local
+    # When +true+, it returns local times with a UTC offset, with +false+ local
     # times are returned as UTC.
     #
     #   # Given this zone:

activesupport/lib/active_support/core_ext/module/attribute_accessors_per_thread.rb

@@ -10,7 +10,7 @@
 # of the module.
 #
 # Note that it can also be scoped per-fiber if Rails.application.config.active_support.isolation_level
-# is set to `:fiber`.
+# is set to +:fiber+.
 class Module
   # Defines a per-thread class attribute and creates class and instance reader methods.
   # The underlying per-thread class variable is set to +nil+, if it is not previously defined.
@@ -118,7 +118,7 @@ def #{sym}=(obj)
   #   Account.user     # => "DHH"
   #   Account.new.user # => "DHH"
   #
-  # Unlike `mattr_accessor`, values are *not* shared with subclasses or parent classes.
+  # Unlike +mattr_accessor+, values are *not* shared with subclasses or parent classes.
   # If a subclass changes the value, the parent class' value is not changed.
   # If the parent class changes the value, the value of subclasses is not changed.
   #

activesupport/lib/active_support/testing/constant_stubbing.rb

@@ -12,7 +12,7 @@ module ConstantStubbing
       #
       #   assert_equal 5000, World::List::Import::LARGE_IMPORT_THRESHOLD = 5000
       #
-      # Using this method rather than forcing `World::List::Import::LARGE_IMPORT_THRESHOLD = 5000` prevents
+      # Using this method rather than forcing <tt>World::List::Import::LARGE_IMPORT_THRESHOLD = 5000</tt> prevents
       # warnings from being thrown, and ensures that the old value is returned after the test has completed.
       #
       # Note: Stubbing a const will stub it across all threads. So if you have concurrent threads