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

[Terry J. Reedy]

Terry J. Reedy added the comment:

Only 138 warnings with 2.7.

Zack, how do I downgrade.  I examined the result of pip install -h but cannot see how.  I presume that 'sphinx' and '1.3.6' should be combined into a '<requirement specifier>' but this latter is not defined and the things I tried, including the output format of 'pip list' did not work.

Does anything else need to be downgraded?

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