[docs] [issue25916] wave module readframes now returns bytes not str

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7ac8e8568da2 by R David Murray in branch '3.5':
#25916: fix a few 'string of bytes' references.
https://hg.python.org/cpython/rev/7ac8e8568da2

New changeset 089f7d761a9c by R David Murray in branch 'default':
Merge: #25916: fix a few 'string of bytes' references.
https://hg.python.org/cpython/rev/089f7d761a9c

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nosy: +python-dev

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