Updated Notification configuration notes (markdown)

Notification-configuration-notes.md

@@ -9,4 +9,7 @@ Looks like there's an issue with some `ARMv7` devices https://github.com/dgtlmoo
 
 ## Email
 - Using a `@` in your mailtos/smtps password, see https://github.com/caronc/apprise/issues/400
-- There are specific apprise helpers for yahoomail, gmail, etc https://github.com/caronc/apprise/wiki/Notify_email
+- There are specific apprise helpers for yahoomail, gmail, etc https://github.com/caronc/apprise/wiki/Notify_email
+
+## Forms/HTTP POST support
+- see https://github.com/caronc/apprise/wiki/Notify_Custom_Form