[docs] [issue29521] Minor warning messages when compiling documentation

[STINNER Victor]

STINNER Victor added the comment:


New changeset b300c660d34d2027d443098ea605a8e0eb51d383 by GitHub in branch '3.6':
Backport36 doc fixes: PR#68 and PR#124 (#125)
https://github.com/python/cpython/commit/b300c660d34d2027d443098ea605a8e0eb51d383


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