Here's the main documentation changes for 5.5:

 - Various kerneldoc script enhancements.

 - More RST conversions; those are slowing down as we run out of things to
   convert, but we're a ways from done still.

 - Dan's "maintainer profile entry" work landed at last.  Now we just need
   to get maintainers to fill in the profiles...

 - A reworking of the parallel build setup to work better with a variety of
   systems (and to not take over huge systems entirely in particular).

 - The MAINTAINERS file is now converted to RST during the build.
   Hopefully nobody ever tries to print this thing, or they will need to
   load a lot of paper.

 - A script and documentation making it easy for maintainers to add Link:
   tags at commit time.

Also included is the removal of a bunch of spurious CR characters.
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