[docs] [issue12028] threading._get_ident(): remove it in the doc and make it public

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

@pitrou: What do you think Antoine?

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nosy: +pitrou

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12028>
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