wlan: update comments for SAP operating band for 5GHZ.

With gAPChannelSelectOperatingBand=5, it is possible to select
a least congested channel in entire 5G band using ACS.

CRs-Fixed: 771703
Change-Id: I4d12f2b821f67677b76cd9a3b8367ed454da3274
diff --git a/firmware_bin/WCNSS_qcom_cfg.ini b/firmware_bin/WCNSS_qcom_cfg.ini
index 6e3bb1a..63db92d 100644
--- a/firmware_bin/WCNSS_qcom_cfg.ini
+++ b/firmware_bin/WCNSS_qcom_cfg.ini
@@ -296,7 +296,7 @@
 
 #SOFTAP Channel Range selection Operating band
 
-# 0:2.4GHZ 1: LOW-5GHZ 2:MID-5GHZ 3:HIGH-5GHZ 4: 4.9HZ BAND
+# 0:2.4GHZ 1: LOW-5GHZ 2:MID-5GHZ 3:HIGH-5GHZ 4: 4.9HZ BAND 5: 5GHZ BAND
 
 gAPChannelSelectOperatingBand=0