[docs] [issue13867] misleading comment in weakrefobject.h

[Roundup Robot]

Roundup Robot added the comment:

New changeset 39e5ab118602 by Georg Brandl in branch '2.7':
Closes #13867: remove untrue comment about PyWeakref_Check().
http://hg.python.org/cpython/rev/39e5ab118602

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<http://bugs.python.org/issue13867>
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