Updated Notification configuration notes (markdown)

Notification-configuration-notes.md

@@ -66,6 +66,8 @@ Always use **`|tojson`** to be sure the string is safe in JSON, for example
 
 For extra headers - see note about headers in the [POST/POSTS section](#postposts)
 
-## GET/PLAIN API 
+## 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