usb(4): manpage cleanup
- Wrap at <80 columns for readability when editing. Rewrap some lines prematurely wrapped to better fit in <80 columns and not waste vertical space.
- Fix SEE ALSO sorting (sort by section first, then manpage name).
- Tweak the compound device description slightly by adding soft stops via commas.
MFC after: 1 week
Reported by: igor [3], manlint [2]
Sponsored by Dell EMC Isilon