PEP257 Clean-up of docstrings. #1996
   Merged  
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Fixes all Pylint failures of
missing-returns-docredundant-returns-docungrouped-importsAlso makes a little headway on
missing-raises-docthough it's unclear if this error should be fixed. Also pylint-dev/pylint@8d35557 makes the badcatching-non-exceptiongo away.Towards #1968.