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

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

ISTM that it applies to both %s and %a, but the note is wrong/imprecise.

The precision determines where the string is truncated, but the actual number of characters is given by the field width.

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nosy: +ezio.melotti

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