Example config: Change 'use_quic' default value

Related to commit a120f143d7
Also point towards the Github issue.

config/config.example.yml

@@ -157,10 +157,14 @@ https_only: false
 ## Note 2: Using QUIC prevents some captcha challenges from appearing.
 ## See: https://github.com/iv-org/invidious/issues/957#issuecomment-576424042
 ##
-## Accepted values: true, false
-## Default: true
+## Note 3: As of 2021-11-12, Google seems to have disabled QUIC on
+## their servers. The default has been changed to 'false'.Read more
+## at: https://github.com/iv-org/invidious/issues/2577
 ##
-#use_quic: true
+## Accepted values: true, false
+## Default: false
+##
+#use_quic: false
 
 ##
 ## Additionnal cookies to be sent when requesting the youtube API.