Update notes for submitted changes

* res_speech: Add a type conversion, and new engine unregister methods

cf/0fa9b82f4cdc98da57a1e4897392d969d5ca0a

@@ -0,0 +1,9 @@
+Code-Review+1: Sean Bright <sean@seanbright.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: Fri, 22 Oct 2021 08:13:20 -0500
+Reviewed-on: https://gerrit.asterisk.org/c/asterisk/+/16643
+Project: asterisk
+Branch: refs/heads/19