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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 1439619daf42 by Georg Brandl in branch '3.4':
Closes #12148: clarify "or's together option flags" in doctest docs.
https://hg.python.org/cpython/rev/1439619daf42

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nosy: +python-dev
resolution:  -> fixed
stage:  -> resolved
status: open -> closed

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