[docs] [issue10344] codecs.open() buffering doc needs fix

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:


New changeset a2670565d8f5c502388378aba1fe73023fd8c8d4 by Victor Stinner (Alexey Izbyshev) in branch 'master':
bpo-32236: open() emits RuntimeWarning if buffering=1 for binary mode (GH-4842)
https://github.com/python/cpython/commit/a2670565d8f5c502388378aba1fe73023fd8c8d4


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nosy: +vstinner

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<https://bugs.python.org/issue10344>
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