Update notes for submitted changes

* apps/app_dial.c: HANGUPCAUSE reason code for CANCEL is set to AST_CAUSE_NORMAL_CLEARING

6c/9e8afd4ea55a33680ee580658230b51f307292

@@ -0,0 +1,9 @@
+Code-Review+1: Joshua Colp <jcolp@sangoma.com>
+Code-Review+1: Kevin Harwell <kharwell@digium.com>
+Code-Review+2: George Joseph <gjoseph@digium.com>
+Verified+2: Joshua Colp <jcolp@sangoma.com>
+Submitted-by: Joshua Colp <jcolp@sangoma.com>
+Submitted-at: Mon, 06 Dec 2021 09:23:37 -0600
+Reviewed-on: https://gerrit.asterisk.org/c/asterisk/+/16344
+Project: asterisk
+Branch: refs/heads/18