A reasonably busy cycle for documentation this time around. There is a new

guide for user-space API documents, rather sparsely populated at the
moment, but it's a start.  Markus improved the infrastructure for
converting diagrams.  Mauro has converted much of the USB documentation
over to RST.  Plus the usual set of fixes, improvements, and tweaks.

There's a bit more than the usual amount of reaching out of Documentation/
to fix comments elsewhere in the tree; I have acks for those where I could
get them.
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