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

[Chris Jerdonek]

Changes by Chris Jerdonek <chris.jerdonek at gmail.com>:


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title: list.remove in for loop -> add to "looping techniques" tutorial a note about modifying sequence
type:  -> enhancement
versions: +Python 3.2, Python 3.3, Python 3.4

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