[docs] [issue15457] consistent treatment of generator terminology

[Chris Jerdonek]

Chris Jerdonek added the comment:

Note to reviewers: changing to "needs patch" because I want to make  changes to the latest patch before this is reviewed (e.g. to the index directives).  I should be able to do this by the end of the weekend.

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stage:  -> needs patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15457>
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