[issue6277] Add description of new syntax of with to 2.7 whatsnew document.

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

AMK writes the whatsnew for 2.7 and I write it for 3.1.
In the case of 3.1, I already have an entry.

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nosy: +rhettinger

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6277>
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