[docs] [issue27689] Add documentation for typing.Generator

[Michael Lee]

Michael Lee added the comment:

Revision 3 -- I changed the protocol for the example so that you stop the generator by sending in a negative number as a sentinel rather then None.

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Added file: http://bugs.python.org/file44027/document-generators-v3.patch

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<http://bugs.python.org/issue27689>
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