nl80211: clarify packet statistics descriptions

The current statistics we keep aren't very clear, some are on
MPDUs and some on MSDUs/MMPDUs. Clarify the descriptions based
on the counters mac80211 keeps.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index ef26ce1..95420fb 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -950,8 +950,8 @@
  *	indicate the relevant values in this struct for them
  * @connected_time: time(in secs) since a station is last connected
  * @inactive_time: time since last station activity (tx/rx) in milliseconds
- * @rx_bytes: bytes received from this station
- * @tx_bytes: bytes transmitted to this station
+ * @rx_bytes: bytes (size of MPDUs) received from this station
+ * @tx_bytes: bytes (size of MPDUs) transmitted to this station
  * @llid: mesh local link id
  * @plid: mesh peer link id
  * @plink_state: mesh peer link state
@@ -964,10 +964,10 @@
  * @chain_signal_avg: per-chain signal strength average in dBm
  * @txrate: current unicast bitrate from this station
  * @rxrate: current unicast bitrate to this station
- * @rx_packets: packets received from this station
- * @tx_packets: packets transmitted to this station
- * @tx_retries: cumulative retry counts
- * @tx_failed: number of failed transmissions (retries exceeded, no ACK)
+ * @rx_packets: packets (MSDUs & MMPDUs) received from this station
+ * @tx_packets: packets (MSDUs & MMPDUs) transmitted to this station
+ * @tx_retries: cumulative retry counts (MPDUs)
+ * @tx_failed: number of failed transmissions (MPDUs) (retries exceeded, no ACK)
  * @rx_dropped_misc:  Dropped for un-specified reason.
  * @bss_param: current BSS parameters
  * @generation: generation number for nl80211 dumps.