[issue12644] document the "%a" conversion in the old string formatting operations

[Eli Bendersky]

Eli Bendersky <eliben at gmail.com> added the comment:

Ezio, I've taken the liberty to adapt your patch with the suggested fixes and commit it to both 3.2 and 3.3

If everything is OK, this issue can be close (I'll do it in a few days if no one else does :-)

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