[docs] [issue24020] threading.local() must be run at module level (doc improvement)

[Raymond Hettinger]

Raymond Hettinger added the comment:

Also, don't use a ".. note::", regular sentences work fine, especially in documentation that is already very short.

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nosy: +rhettinger

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24020>
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