wifi: ieee80211: add missing doc short descriptions

Some structures erroneously don't have a short description,
add the missing descriptions.

Link: https://msgid.link/20240515093852.16f4355e918e.I940276a4fb006ada68ab1a3e6077e3229fff0f14@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>