Add newline to end of file to fix partial injection

Change-type: patch

Author: klutchell

pages/faq/troubleshooting/debugging-device-gateway.md

@@ -68,4 +68,4 @@ PING 9294512.local (172.17.0.1): 56 data bytes
 1 packets transmitted, 1 packets received, 0% packet loss
 round-trip min/avg/max = 0.400/0.400/0.400 ms
 ...
-```
+```