Another moderately busy cycle for documentation, including:

- The minimum Sphinx requirement has been raised to 2.4.4, following a
  warning that was added in 6.2.

- Some reworking of the Documentation/process front page to, hopefully,
  make it more useful.

- Various kernel-doc tweaks to, for example, make it deal properly with
  __counted_by annotations.

- We have also restored a warning for documentation of nonexistent
  structure members that disappeared a while back.  That had the delightful
  consequence of adding some 600 warnings to the docs build.  A sustained
  effort by Randy, Vegard, and myself has addressed almost all of those,
  bringing the documentation back into sync with the code.  The fixes are
  going through the appropriate maintainer trees.

- Various improvements to the HTML rendered docs, including automatic links
  to Git revisions and a nice new pulldown to make translations easy to
  access.

- Speaking of translations, more of those for Spanish and Chinese.

...plus the usual stream of documentation updates and typo fixes.
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