mac80211: fix some encapsulation offload kernel-doc

Add a missing kernel-doc entry for the offload_flags, and
correct the name of the update_vif_offload method.

Link: https://lore.kernel.org/r/20200918132115.d46a0915ba8a.Ibba536d04a5a5fb655f8ef6e51b247457bfda4ca@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

include/net/mac80211.h

@@ -1690,6 +1690,8 @@ enum ieee80211_offload_flags {
  * @txq: the multicast data TX queue (if driver uses the TXQ abstraction)
  * @txqs_stopped: per AC flag to indicate that intermediate TXQs are stopped,
  *	protected by fq->lock.
+ * @offload_flags: 802.3 -> 802.11 enapsulation offload flags, see
+ *	&enum ieee80211_offload_flags.
  */
 struct ieee80211_vif {
 	enum nl80211_iftype type;
@@ -3864,7 +3866,7 @@ enum ieee80211_reconfig_type {
  * @set_tid_config: Apply TID specific configurations. This callback may sleep.
  * @reset_tid_config: Reset TID specific configuration for the peer.
  *	This callback may sleep.
- * @update_vif_config: Update virtual interface offload flags
+ * @update_vif_offload: Update virtual interface offload flags
  *	This callback may sleep.
  * @sta_set_4addr: Called to notify the driver when a station starts/stops using
  *	4-address mode