fix incorrect comment

activesupport/lib/active_support/core_ext/string/output_safety.rb

@@ -144,7 +144,7 @@ def to_yaml(*args)
     UNSAFE_STRING_METHODS.each do |unsafe_method|
       class_eval <<-EOT, __FILE__, __LINE__ + 1
         def #{unsafe_method}(*args, &block)       # def capitalize(*args, &block)
-          to_str.#{unsafe_method}(*args, &block)  #   to_str.gsub(*args, &block)
+          to_str.#{unsafe_method}(*args, &block)  #   to_str.capitalize(*args, &block)
         end                                       # end
 
         def #{unsafe_method}!(*args)              # def capitalize!(*args)