copy edits[ci skip]

actionpack/lib/action_controller/metal.rb

@@ -183,9 +183,7 @@ def response_body=(body)
       super
     end
     
-    # Tests if render or redirect already happended. Could be useful when used as a 
-    # conditional to <tt>return</tt> early out a controller action to avoid <tt>AbstractController::DoubleRenderError</tt>
-    # example in case of multiple render/redirects in single controller action
+    # Tests if render or redirect has already happened.
     def performed?
       response_body || (response && response.committed?)
     end