This cop is necessary so the `Layout/IndentationConsistency` cop works properly when its `EnforcedStyle` is set to `Rails`, and so incorrect indentation for `private` methods is properly detected.
https://www.rubydoc.info/gems/rubocop-rspec/1.5.0/RuboCop/Cop/RSpec/NotToNot
This way we can ask contributors to follow some basic guidelines like removing trailing whitespaces while not overwhelming them with all our rules.