mac80211: fix kernel-doc "bad line" warning

Fix 88 instances of a kernel-doc warning:
  ../include/net/mac80211.h:2083: warning: bad line:  >

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: linux-wireless@vger.kernel.org
Cc: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>