Updated Notification configuration notes (markdown)

Notification-configuration-notes.md

@@ -68,4 +68,6 @@ For extra headers - see note about headers in the [POST/POSTS section](#postpost
 
 ## GET/PLAIN API
 
+Avoid using `json://`, however if you need to add some special GET arguments (`?var=123&var2=4444`) you need to follow these steps
+
 See https://github.com/caronc/apprise/wiki/Notify_Custom_JSON#get-parameter-manipulation for the special syntax