[issue5621] Add description of special case to "Assignment statements" section

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

The patch submission was correct.

I edited the patch a bit, moved the example from augmented assignment to
the regular assignment and added a link from there to the new section.

Committed in r74822.

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resolution: works for me -> accepted
status: open -> closed

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