[docs] [issue16682] Document that audioop works with bytes, not strings

[Terry J. Reedy]

Terry J. Reedy added the comment:

Patch looks good to me, all three occurrences of 'string' are fixed.

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nosy: +terry.reedy
stage: patch review -> commit review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16682>
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