[issue14954] weakref doc clarification

[Ethan Furman]

Ethan Furman <ethan at stoneleaf.us> added the comment:

Changed "... will return the object ..." to " ... may return the object ..."

For reference, here's the new text:

A weak reference to an object is not enough to keep the object alive: when the only remaining references to a referent are weak references,
:term:`garbage collection` is free to destroy the referent and reuse its memory for something else.  However, until the object is actually destroyed the weak reference may return the object even if there are no strong references to it.

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Added file: http://bugs.python.org/file26179/weakref_doc_updates_v2.diff

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