copy edit and remove nodoc on instance_values method [ci skip]

activesupport/lib/active_support/core_ext/object/instance_variables.rb

@@ -1,6 +1,6 @@
 class Object
-  # Returns a hash that maps instance variable names without "@" to their
-  # corresponding values. Keys are strings.
+  # Returns a hash with string keys that maps instance variable names without "@" to their
+  # corresponding values.
   #
   #   class C
   #     def initialize(x, y)
@@ -9,11 +9,11 @@ class Object
   #   end
   #
   #   C.new(0, 1).instance_values # => {"x" => 0, "y" => 1}
-  def instance_values #:nodoc:
+  def instance_values
     Hash[instance_variables.map { |name| [name[1..-1], instance_variable_get(name)] }]
   end
 
-  # Returns an array of instance variable names including "@". They are strings.
+  # Returns an array of instance variable names including "@".
   #
   #   class C
   #     def initialize(x, y)