Upgrade Sphinx version to 2.3.1 for Read the Docs

What’s the problem this feature will solve? The pip documentation says in the footer: “Created using Sphinx 2.2.0.” The Sphinx website says the latest version of Sphinx is 2.3.1.

Describe the solution you’d like Update the dependency at tools/requirements/docs.txt so it pins to Sphinx 2.3.1, not sphinx == 2.2.0. Run the tests, see whether the documentation build fails, look at Sphinx’s recent changes to see what to update.

I believe one of the maintainers of the pip project on Read the Docs might also need to log in and fiddle with the preferred version of Sphinx to get things to work right.

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[sk-ip]

Hello, @pradyunsg #7682 seems to be resolving some other issue, I have made a pull request please review and let me know.

[pradyunsg]

Indeed! I linked to the wrong PR – https://github.com/pypa/pip/pull/7681 was the one I’d intended to link to.