Merge pull request #23473 from gsamokovarov/kernel-module-function

Don't publicize Kernel core extensions

activesupport/lib/active_support/core_ext/kernel/concern.rb

 require 'active_support/core_ext/module/concerning'
 
 module Kernel
+  module_function
+
   # A shortcut to define a toplevel concern, not within a module.
   #
   # See Module::Concerning for more.

activesupport/lib/active_support/core_ext/kernel/reporting.rb

 module Kernel
+  module_function
+
   # Sets $VERBOSE to nil for the duration of the block and back to its original
   # value afterwards.
   #