There's not a huge amount of activity in the docs tree this time around,

but a few significant changes even so:

- A complete rewriting of the top-level index.rst file, which mostly
  reflects itself in a redone top page in the HTML-rendered docs.  The hope
  is that the new organization will be a friendlier starting point for
  both users and developers.

- Some math-rendering improvements.

- A coding-style.rst update on the use of BUG() and WARN()

- A big maintainer-PHP guide update.

- Some code-of-conduct updates

- More Chinese translation work

Plus the usual pile of typo fixes, corrections, and updates.
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