Document that the IEEE80211_DEBUG kernel option is needed for using the wlan(4) debugging controls with wording slightly different from that in the PR.
Document that the IEEE80211_DEBUG kernel option is needed for
using the wlan(4) debugging controls with wording slightly
different from that in the PR.

PR:		142367
Submitted by:	Matthew Thyer <matt.thyer@gmail.com>
MFC after:	2 weeks

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase