Merge pull request #9905 from docunext/master

ActiveSupport::MessageVerifier: Updated docs due to removal of serializer accessor

activesupport/lib/active_support/message_verifier.rb

@@ -19,10 +19,10 @@ module ActiveSupport
   #   end
   #
   # By default it uses Marshal to serialize the message. If you want to use
-  # another serialization method, you can set the serializer attribute to
-  # something that responds to dump and load, e.g.:
+  # another serialization method, you can set the serializer in the options
+  # hash upon initialization:
   #
-  #   @verifier.serializer = YAML
+  #   @verifier = ActiveSupport::MessageVerifier.new('s3Krit', serializer: YAML)
   class MessageVerifier
     class InvalidSignature < StandardError; end