[issue13867] misleading comment in weakrefobject.h

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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components: +Library (Lib) -Documentation, Extension Modules
nosy: +fdrake, pitrou

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13867>
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