wifi: nl80211: cleanup nl80211.h kernel-doc

Fix all of the kernel-doc issues in nl80211.h.
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Link: https://msgid.link/20240319-kdoc-nl80211-v1-3-549e09d52866@quicinc.comSigned-off-by: Johannes Berg <johannes.berg@intel.com>