Update notes for submitted changes

* app_mf, app_sf: Return -1 if channel hangs up.

90/24bb989b2776014213c4e7577f9ba06e208403

@@ -0,0 +1,9 @@
+Code-Review+1: Joshua Colp <jcolp@sangoma.com>
+Code-Review+2: Kevin Harwell <kharwell@digium.com>
+Code-Review+1: Benjamin Keith Ford <bford@digium.com>
+Verified+2: Kevin Harwell <kharwell@digium.com>
+Submitted-by: Kevin Harwell <kharwell@digium.com>
+Submitted-at: Fri, 08 Apr 2022 16:34:46 -0500
+Reviewed-on: https://gerrit.asterisk.org/c/asterisk/+/18283
+Project: asterisk
+Branch: refs/heads/18