[docs] [issue20063] Docs imply that set does not support .pop() method

[Roundup Robot]

Roundup Robot added the comment:

New changeset 3598805d7636 by R David Murray in branch '2.7':
#20063: Remove inaccurate/confusing statement about support of 'pop' method.
http://hg.python.org/cpython/rev/3598805d7636

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nosy: +python-dev

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