Broken link on the 'Hacking' page

[MarcellPerger1]

There is a broken link on the 'Hacking' page:

The Sphinx to generate HTML docs and src_c/docs/{module}_doc.h C headers from reStructuredText source actually appears to be 2 separate links:

• The first link is just the first word (Sphinx) and links to a 400 Bad Request page (http://sphinx.pocoo.org/index.html)
• The rest of it doesn't appear to link to anywhere (doesn't do anything when clicked, no href attribute)

(But I cannot find the source code for this on Github)