[issue16724] Rename `data` argument names to `bytes`

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

> If hexlify is not accepting anything except bytes, it is better be explicit.

But it is very explicit in the link you provided: both a note at the top, and the words "binary data" in the description of every function.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16724>
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