usb: fix the comment with regards to DocBook
The USB gadget documentation is not at DocBook anymore.
The main file was converted to ReST, and stored at
Documentation/driver-api/usb/gadget.rst, but there are
still several plain text files related to gadget under
Documentation/usb.
So, be generic and just mention documentation
without specifying where it is.
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>
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