[docs] [issue26638] Avoid warnings about missing CLI options when building documentation

[SilentGhost]

SilentGhost added the comment:

Patch  (v3) is fine, except it no longer applies cleanly. I have a patch against the tip which I could upload if needed.

I would also be in favour of disabling the unittest options directly, currently no link is generated and it doesn't seem like there is a straightforward solution in sight.

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nosy: +SilentGhost
stage: patch review -> commit review
versions: +Python 3.7

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<http://bugs.python.org/issue26638>
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