[docs] [issue16225] add to "looping techniques" tutorial a note about modifying sequence

[Chris Jerdonek]

Chris Jerdonek added the comment:

Committed.  Thanks for reporting the suggestion, Ian.

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resolution:  -> fixed
stage: patch review -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16225>
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