fixup! Remove trailing whitespace to pacify rubocop

spec/rspec/rails/example/controller_example_group_spec.rb

@@ -27,7 +27,7 @@ def method_missing(_name, *_args, **kwargs, &_block); a_method(**kwargs); end
 
           # This example requires prepend so that the `method_missing` definition
           # from `ControllerExampleGroup` bubbles up to our artificial one, in reality
-          # this is likely to be either an internal RSpec dispatch or one from a 3rd 
+          # this is likely to be either an internal RSpec dispatch or one from a 3rd
           # party gem.
           prepend ControllerExampleGroup
         end