[docs] [issue32208] Improve semaphore documentation

[Andrew Svetlov]

Andrew Svetlov <andrew.svetlov at gmail.com> added the comment:


New changeset a04ca12e12b522850e7e9244c250754d3cd36f0a by Andrew Svetlov (Miss Islington (bot)) in branch '3.6':
bpo-32208: update threading.Semaphore docs and add unit test (GH-4709) (#4750)
https://github.com/python/cpython/commit/a04ca12e12b522850e7e9244c250754d3cd36f0a


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