Don't make rdoc generation take an unreasonable amount of time

On CI, this takes about 8 hours. On my PC I canceled after 3.

I suspect this comment in rdoc to be relevant (since this method is where it is stuck): https://github.com/ruby/rdoc/blob/4b846606904cc2db3999e5482c69a27f7d96947c/lib/rdoc/mixin.rb#L68-L71
Removing a few includes eventually makes it complete. It doesn't seem to matter which ones you remove.

rails#52185 was the trigger for this.

Author: Earlopain

actionpack/lib/action_controller/base.rb

@@ -266,6 +266,8 @@ def self.without_modules(*modules)
       ParamsWrapper
     ]
 
+    # Note: Documenting these severely degrates the performance of rdoc
+    # :stopdoc:
     include AbstractController::Rendering
     include AbstractController::Translation
     include AbstractController::AssetPaths
@@ -309,6 +311,7 @@ def self.without_modules(*modules)
     # Params wrapper should come before instrumentation so they are properly showed
     # in logs
     include ParamsWrapper
+    # :startdoc:
     setup_renderer!
 
     # Define some internal variables that should not be propagated to the view.