Update notes for submitted changes

* app_chanisavail.c: Simplify dialplan using ChanIsAvail.

a7/692ce2f4cf1d2a591cb94e176fda16199113c6

@@ -0,0 +1,9 @@
+Code-Review+1: Sean Bright <sean.bright@gmail.com>
+Code-Review+1: Joshua Colp <jcolp@sangoma.com>
+Code-Review+2: George Joseph <gjoseph@digium.com>
+Verified+2: Friendly Automation
+Submitted-by: Friendly Automation
+Submitted-at: Tue, 07 Jan 2020 13:58:25 -0600
+Reviewed-on: https://gerrit.asterisk.org/c/asterisk/+/13516
+Project: asterisk
+Branch: refs/heads/16