[docs] [issue19345] Unclear phrasing in whatsnew/3.4.rst

[STINNER Victor]

STINNER Victor added the comment:

> The PyThreadState.tick_counter field has been value: its value was meaningless since Python 3.2 (“new GIL”).

oops, "has been removed" :-)

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<http://bugs.python.org/issue19345>
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