[docs] [issue22006] thread module documentation erroneously(?) states not all built-in functions that do blocking I/O release the GIL

[Roundup Robot]

Roundup Robot added the comment:

New changeset 4f359c631bb0 by Mark Dickinson in branch '2.7':
Issue #22006: Remove outdated thread module caveat.  Thanks Dan O'Reilly for the report.
http://hg.python.org/cpython/rev/4f359c631bb0

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<http://bugs.python.org/issue22006>
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