Merge pull request rails#41267 from arjan0307/patch-4

Provide a working example for a filter_parameters lambda

Author: rafaelfranca

railties/test/application/configuration_test.rb

@@ -468,7 +468,7 @@ class Comment < ActiveRecord::Base
     test "filter_parameters should be able to set via config.filter_parameters" do
       add_to_config <<-RUBY
         config.filter_parameters += [ :foo, 'bar', lambda { |key, value|
-          value = value.reverse if /baz/.match?(key)
+          value.reverse! if /baz/.match?(key)
         }]
       RUBY