[issue20090] slight ambiguity in README.txt instructions for building docs

[Roundup Robot]

Roundup Robot added the comment:

New changeset d975f50de5aa by Georg Brandl in branch '3.3':
Closes #20090: update Doc/README and the error message in sphinx-build.py to make
http://hg.python.org/cpython/rev/d975f50de5aa

New changeset 43820a4fcaba by Georg Brandl in branch 'default':
Closes #20090: update Doc/README.txt for the changes in the 3.4 branch.
http://hg.python.org/cpython/rev/43820a4fcaba

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