More using <tt>x</tt> instead of +x+ when the latter renders improperly.

actionpack/lib/action_controller/metal/params_wrapper.rb

@@ -48,7 +48,7 @@ module ActionController
   # method attribute_names.
   #
   # If you're going to pass the parameters to an +ActiveModel+ object (such as
-  # +User.new(params[:user])+), you might consider passing the model class to
+  # <tt>User.new(params[:user])</tt>), you might consider passing the model class to
   # the method instead. The +ParamsWrapper+ will actually try to determine the
   # list of attribute names from the model and only wrap those attributes:
   #

actionpack/lib/action_dispatch/middleware/reloader.rb

@@ -20,8 +20,8 @@ module ActionDispatch
   # By default, ActionDispatch::Reloader is included in the middleware stack
   # only in the development environment; specifically, when config.cache_classes
   # is false. Callbacks may be registered even when it is not included in the
-  # middleware stack, but are executed only when +ActionDispatch::Reloader.prepare!+
-  # or +ActionDispatch::Reloader.cleanup!+ are called manually.
+  # middleware stack, but are executed only when <tt>ActionDispatch::Reloader.prepare!</tt>
+  # or <tt>ActionDispatch::Reloader.cleanup!</tt> are called manually.
   #
   class Reloader
     include ActiveSupport::Callbacks

activerecord/lib/active_record/explain.rb

@@ -70,7 +70,7 @@ def exec_explain(queries) # :nodoc:
     # the threshold is set to 0.
     #
     # As the name of the method suggests this only applies to automatic
-    # EXPLAINs, manual calls to +ActiveRecord::Relation#explain+ run.
+    # EXPLAINs, manual calls to <tt>ActiveRecord::Relation#explain</tt> run.
     def silence_auto_explain
       current = Thread.current
       original, current[:available_queries_for_explain] = current[:available_queries_for_explain], false