According to https://github.com/sphinx-doc/sphinx/blob/master/CONTRIBUTING.rst#id32 there are two branches: master and major.minor (=stable).

The git repository has indeed only two branches.

The online documentation is available at:

• http://www.sphinx-doc.org/en/master/ - showing in the title 1.8.0+, and
• http://www.sphinx-doc.org/en/stable/ - showing in the title 1.6.8+

In particular,

www.sphinx-doc.org/en/stable/ext/autodoc.html doesn't mention autodoc_inherit_docstrings, which is part of 1.7, while http://www.sphinx-doc.org/en/master/ext/autodoc.html mentions it.

If 1.7.1 is the stable version, please replace all occurrences at /en/stable with the documentation for 1.7, otherwise clarify, that 1.6.8 is the stable version.