Merge pull request #21264 from jonatack/fix-action-controller-strong-params-typo

[skip ci] Fix minor typo

actionpack/lib/action_controller/metal/strong_parameters.rb

@@ -461,7 +461,7 @@ def transform_keys(&block)
       end
     end
 
-    # Performs keys transfomration and returns the altered
+    # Performs keys transformation and returns the altered
     # <tt>ActionController::Parameters</tt> instance.
     def transform_keys!(&block)
       @parameters.transform_keys!(&block)