Fix backslash carriage return comments (#4663)

* Update comments.py

* Update CHANGES.md

* Update test_black.py

* Update tests/test_black.py

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci



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Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Co-authored-by: cobalt <61329810+cobaltt7@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>