Don't report DOC6xx if no docstring or short docstring #360

Job	Run time
Test pre-commit console encoding	38s
Test Python 3.8 (ubuntu-latest)	52s
Test Python 3.9 (ubuntu-latest)	54s
Test Python 3.10 (ubuntu-latest)	59s
Test Python 3.11 (ubuntu-latest)	52s
Test Python 3.12 (ubuntu-latest)	18s
Test Python 3.8 (windows-latest)	2m 22s
Test Python 3.9 (windows-latest)	2m 28s
Test Python 3.10 (windows-latest)	2m 10s
Test Python 3.11 (windows-latest)	2m 21s
Test Python 3.12 (windows-latest)	57s
Test Python 3.8 (macOS-latest)	1m 16s
Test Python 3.9 (macOS-latest)	47s
Test Python 3.10 (macOS-latest)	45s
Test Python 3.11 (macOS-latest)	1m 1s
Test Python 3.12 (macOS-latest)	16s
	18m 56s

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