Update refinements docs

Co-Authored-By: Vladimir Dementyev <dementiev.vm@gmail.com>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66788 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

doc/syntax/refinements.rdoc

@@ -247,11 +247,9 @@ Note that +super+ in a method of a refinement invokes the method in the
 refined class even if there is another refinement which has been activated in
 the same context.
 
-== Indirect Method Calls
+== Methods Introspection
 
-When using indirect method access such as Kernel#send, Kernel#method or
-Kernel#respond_to? refinements are not honored for the caller context during
-method lookup.
+When using introspection methods such as Kernel#method or Kernel#methods refinements are not honored.
 
 This behavior may be changed in the future.