iwlwifi: mvm: fix some kerneldoc issues

A few fields were missing their kerneldoc in the station
capabilities.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Fixes: c8a2e7a2 ("iwlwifi: sta: set max HE max A-MPDU according to HE capa")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20211024165252.fecbcd7c2fcc.I7419f102b798ba0cecd93c80f345b241670e0683@changeid


Signed-off-by: Luca Coelho <luciano.coelho@intel.com>