fix attribute_accessors docs to support 1.8 syntax

activesupport/lib/active_support/core_ext/class/attribute_accessors.rb

@@ -21,11 +21,11 @@ class Class
   #   end
   #   # => NameError: invalid attribute name
   #
-  # If you want to opt out the instance reader method, you can pass <tt>instance_reader: false</tt>
-  # or <tt>instance_accessor: false</tt>.
+  # If you want to opt out the instance reader method, you can pass <tt>:instance_reader => false</tt>
+  # or <tt>:instance_accessor => false</tt>.
   #
   #   class Person
-  #     cattr_reader :hair_colors, instance_reader: false
+  #     cattr_reader :hair_colors, :instance_reader => false
   #   end
   #
   #   Person.new.hair_colors # => NoMethodError
@@ -71,11 +71,11 @@ def #{sym}
   #   end
   #   # => NameError: invalid attribute name
   #
-  # If you want to opt out the instance writer method, pass <tt>instance_writer: false</tt>
-  # or <tt>instance_accessor: false</tt>.
+  # If you want to opt out the instance writer method, pass <tt>:instance_writer => false</tt>
+  # or <tt>:instance_accessor => false</tt>.
   #
   #   class Person
-  #     cattr_writer :hair_colors, instance_writer: false
+  #     cattr_writer :hair_colors, :instance_writer => false
   #   end
   #
   #   Person.new.hair_colors = [:blonde, :red] # => NoMethodError
@@ -133,20 +133,20 @@ def #{sym}=(obj)
   #   Male.hair_colors << :blue
   #   Person.hair_colors # => [:brown, :black, :blonde, :red, :blue]
   #
-  # To opt out of the instance writer method, pass <tt>instance_writer: false</tt>.
-  # To opt out of the instance reader method, pass <tt>instance_reader: false</tt>.
+  # To opt out of the instance writer method, pass <tt>:instance_writer => false</tt>.
+  # To opt out of the instance reader method, pass <tt>:instance_reader => false</tt>.
   #
   #   class Person
-  #     cattr_accessor :hair_colors, instance_writer: false, instance_reader: false
+  #     cattr_accessor :hair_colors, :instance_writer => false, :instance_reader => false
   #   end
   #
   #   Person.new.hair_colors = [:brown]  # => NoMethodError
   #   Person.new.hair_colors             # => NoMethodError
   #
-  # Or pass <tt>instance_accessor: false</tt>, to opt out both instance methods.
+  # Or pass <tt>:instance_accessor => false</tt>, to opt out both instance methods.
   #
   #   class Person
-  #     cattr_accessor :hair_colors, instance_accessor: false
+  #     cattr_accessor :hair_colors, :instance_accessor => false
   #   end
   #
   #   Person.new.hair_colors = [:brown]  # => NoMethodError