[docs] [issue17546] Document the circumstances where the locals() dict get updated

[Martin Panter]

Martin Panter added the comment:

Some minor tweaks to my earlier patch:
* list comprehension → comprehension
* time it is called → time of the call

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versions: +Python 3.6, Python 3.7 -Python 3.3, Python 3.4
Added file: http://bugs.python.org/file45735/locals_doc.04.patch

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