[docs] [issue29179] Py_UNUSED is not documented

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:


New changeset 2138163621196a186975796afb2b0a6aa335231d by Victor Stinner (Petr Viktorin) in branch 'master':
bpo-29179: Document the Py_UNUSED macro (#4341)
https://github.com/python/cpython/commit/2138163621196a186975796afb2b0a6aa335231d


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nosy: +haypo

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<https://bugs.python.org/issue29179>
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