[docs] [issue31191] Fix grammar in threading.Barrier docs

[Mariatta Wijaya]

Mariatta Wijaya added the comment:


New changeset 2dfafa3c565c0b51920269a891fa270848b378d5 by Mariatta in branch '3.6':
bpo-31191: Improve grammar in threading.Barrier docs (GH-3080) (GH-3224)
https://github.com/python/cpython/commit/2dfafa3c565c0b51920269a891fa270848b378d5


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<http://bugs.python.org/issue31191>
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