[docs] [issue26506] hex() documentation: mention "%x" % int

[STINNER Victor]

STINNER Victor added the comment:

Serhiy Storchaka added the comment:
> If document alternatives for hex(), we should also document formatting
alternatives for bin(), oct(),

Ok for these two since they also add a prefix. But I don't see the point of
documenting alternatives for the other listed functions. The matter here is
the 0x prefix.

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<http://bugs.python.org/issue26506>
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