[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:

I think that threading._get_ident() is more reliable than threading.current_thread().ident because Thread.ident can be None in some cases.

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<http://bugs.python.org/issue12028>
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