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

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

I think adding the word 'bitwise' in front of "or'ed" and linking it to that section would be sufficient.

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nosy: +r.david.murray
versions: +Python 3.2, Python 3.3

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