wifi manuals: Mlink + document description consistencyHEADmain

Interfaces all have an mlink to if_$foo. Add these for the missing ones
and remove an incorrect one from rtwn_pci. Wireless network drivers are
all accessible via `apropos -s4 "wireless network driver", except two
which are "wireless network device". I actually prefer the latter, but
make them all consistent upon the more common parlance. Tag SPDX on one
of the files I touched, while here.

MFC after:		3 days
Reviewed by:		bz, carlavilla, mhorne
Approved by:		carlavilla, mhorne (mentors)
Differential Revision:	https://reviews.freebsd.org/D49063

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