Merge pull request rails#22035 from yui-knk/update_doc_anonymous

[ci skip] Add more code examples for `Module#anonymous?` docs

activesupport/lib/active_support/core_ext/module/anonymous.rb

@@ -7,7 +7,7 @@ class Module
   #   m = Module.new
   #   m.name # => nil
   #
-  # +anonymous?+ method returns true if module does not have a name:
+  # +anonymous?+ method returns true if module does not have a name, false otherwise:
   #
   #   Module.new.anonymous? # => true
   #
@@ -18,8 +18,10 @@ class Module
   # via the +module+ or +class+ keyword or by an explicit assignment:
   #
   #   m = Module.new # creates an anonymous module
-  #   M = m          # => m gets a name here as a side-effect
+  #   m.anonymous?   # => true
+  #   M = m          # m gets a name here as a side-effect
   #   m.name         # => "M"
+  #   m.anonymous?   # => false
   def anonymous?
     name.nil?
   end