[issue15660] Clarify 0 prefix for width specifier in str.format doc,

[Roundup Robot]

Roundup Robot added the comment:

New changeset de669512df97 by Terry Jan Reedy in branch '2.7':
Issue #15660: Further clarify 0 prefix for width specifier in formats.
https://hg.python.org/cpython/rev/de669512df97

New changeset 34cbc5d8a173 by Terry Jan Reedy in branch '3.5':
Issue #15660: Further clarify 0 prefix for width specifier in formats.
https://hg.python.org/cpython/rev/34cbc5d8a173

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<http://bugs.python.org/issue15660>
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