nl80211: add missing kerneldoc for new *_PAD attributes

Nicolas's patch missed this, now generating docbook warnings.
Add the missing descriptions to address that.

Fixes: 2dad624e6dd6 ("wireless: use nla_put_u64_64bit()")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

include/uapi/linux/nl80211.h

@@ -1817,6 +1817,8 @@ enum nl80211_commands {
  * @NL80211_ATTR_STA_SUPPORT_P2P_PS: whether P2P PS mechanism supported
  *	or not. u8, one of the values of &enum nl80211_sta_p2p_ps_status
  *
+ * @NL80211_ATTR_PAD: attribute used for padding for 64-bit alignment
+ *
  * @NUM_NL80211_ATTR: total number of nl80211_attrs available
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
@@ -3013,6 +3015,7 @@ enum nl80211_user_reg_hint_type {
  *	transmitting data (on channel or globally)
  * @NL80211_SURVEY_INFO_TIME_SCAN: time the radio spent for scan
  *	(on this channel or globally)
+ * @NL80211_SURVEY_INFO_PAD: attribute used for padding for 64-bit alignment
  * @NL80211_SURVEY_INFO_MAX: highest survey info attribute number
  *	currently defined
  * @__NL80211_SURVEY_INFO_AFTER_LAST: internal use
@@ -3454,6 +3457,7 @@ enum nl80211_bss_scan_width {
  * @NL80211_BSS_LAST_SEEN_BOOTTIME: CLOCK_BOOTTIME timestamp when this entry
  *	was last updated by a received frame. The value is expected to be
  *	accurate to about 10ms. (u64, nanoseconds)
+ * @NL80211_BSS_PAD: attribute used for padding for 64-bit alignment
  * @__NL80211_BSS_AFTER_LAST: internal
  * @NL80211_BSS_MAX: highest BSS attribute
  */