wifi: mac80211: add kernel-doc for EHT structure

Looks like this is required, even if all of the members
are separately described. Add a line to avoid the warning.

Fixes: f66c48af ("mac80211: support minimal EHT rate reporting on RX")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

include/net/mac80211.h

@@ -1504,6 +1504,7 @@ enum mac80211_rx_encoding {
  * @he_ru: HE RU, from &enum nl80211_he_ru_alloc
  * @he_gi: HE GI, from &enum nl80211_he_gi
  * @he_dcm: HE DCM value
+ * @eht: EHT specific rate information
  * @eht.ru: EHT RU, from &enum nl80211_eht_ru_alloc
  * @eht.gi: EHT GI, from &enum nl80211_eht_gi
  * @rx_flags: internal RX flags for mac80211