Merge pull request #32851 from yskkin/doc_require_dependency

Document require_dependency [ci skip]

activesupport/lib/active_support/dependencies.rb

@@ -224,6 +224,8 @@ def require_or_load(file_name)
         Dependencies.require_or_load(file_name)
       end
 
+      # :doc:
+
       # Interprets a file using <tt>mechanism</tt> and marks its defined
       # constants as autoloaded. <tt>file_name</tt> can be either a string or
       # respond to <tt>to_path</tt>.
@@ -242,6 +244,8 @@ def require_dependency(file_name, message = "No such file to load -- %s.rb")
         Dependencies.depend_on(file_name, message)
       end
 
+      # :nodoc:
+
       def load_dependency(file)
         if Dependencies.load? && Dependencies.constant_watch_stack.watching?
           Dependencies.new_constants_in(Object) { yield }