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

[Roundup Robot]

Roundup Robot added the comment:

New changeset dc006b6212e7 by Chris Jerdonek in branch '2.7':
Issue #16225: Backport from 3.2: Add additional note to tutorial about looping.
http://hg.python.org/cpython/rev/dc006b6212e7

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