[issue14878] Improve documentation for generator.send method

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7b8c0bf8fcb8 by Andrew Kuchling in branch '2.7':
#14878: add cross-reference to the yield statement.
http://hg.python.org/cpython/rev/7b8c0bf8fcb8

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nosy: +python-dev

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