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> Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>
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