[docs] [issue31065] Documentation for Popen.poll is unclear

[Gregory P. Smith]

Gregory P. Smith added the comment:


New changeset 006617ff7d6df3fdedcfe53e94ee2c52cc796437 by Gregory P. Smith (Ivan Chernoff) in branch 'master':
bpo-31065: Add doc about Popen.poll returning None. (#3169)
https://github.com/python/cpython/commit/006617ff7d6df3fdedcfe53e94ee2c52cc796437


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nosy: +gregory.p.smith

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