[docs] [issue12148] Clarify "or-ing together" doctest option flags

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

I found “bitwise OR-ed” in library/fcntl.rst library/functions.rst library/os.rst library/winsound.rst (using grep, not Sphinx :)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12148>
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