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23cde4d1 - Add known problems to `compare-to-empty-string` documentation (#5879)

Add known problems to `compare-to-empty-string` documentation (#5879) ## Summary Add known problems to `compare-to-empty-string` documentation. Related to #5873. Tweaked the example in the documentation to be a tad more concise and correct (that the rule is most applicable when comparing to a `str` variable). ## Test Plan `python scripts/check_docs_formatted.py`