net/wireless: wireless.h: drop duplicate word in comments

Drop doubled word "threshold" in a comment.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: netdev@vger.kernel.org
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: linux-wireless@vger.kernel.org
Cc: Johannes Berg <johannes@sipsolutions.net>
Link: https://lore.kernel.org/r/20200715164325.9109-2-rdunlap@infradead.orgSigned-off-by: Johannes Berg <johannes.berg@intel.com>

include/uapi/linux/wireless.h

@@ -914,7 +914,7 @@ union iwreq_data {
 	struct iw_param	sens;		/* signal level threshold */
 	struct iw_param	bitrate;	/* default bit rate */
 	struct iw_param	txpower;	/* default transmit power */
-	struct iw_param	rts;		/* RTS threshold threshold */
+	struct iw_param	rts;		/* RTS threshold */
 	struct iw_param	frag;		/* Fragmentation threshold */
 	__u32		mode;		/* Operation mode */
 	struct iw_param	retry;		/* Retry limits & lifetime */