A relatively calm cycle for the docs tree again.

  - The old driver statement has been added to the kernel docs.

  - We have a couple of new helper scripts.  find-unused-docs.sh from Sayli
    Karnic will point out kerneldoc comments that are not actually used in
    the documentation.  Jani Nikula's documentation-file-ref-check finds
    references to non-existing files.

  - A new ftrace document from Steve Rostedt.

  - Vinod Koul converted the dmaengine docs to RST

Beyond that, it's mostly simple fixes.
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