Update quick_start.md

Adding recommendation for using phone camera for scanning data matrix on XBee.

Author: SFEMark

docs/quick_start.md

@@ -49,7 +49,7 @@ If you've purchased the kit, there will be a welcome card included that contains
 
 ## Register the LoRaWAN® Node
 
-To provision a device, go to the following link, log in if necessary, and scan the Data Matrix on the XBee. 
+To provision a device, go to the following link, log in if necessary, and scan the Data Matrix on the XBee. We recommend using the camera on a mobile device/phone to scan the Data Matrix.
 
 <center>
 [Digi Scan :fontawesome-solid-camera:{ .heart }](https://scan-us1.haxiot.com/){ .md-button .md-button--primary }