Update notes for submitted changes

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

8b/eac820c0010cd849d2e38467f4d32ba495a5c7

@@ -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: George Joseph <gjoseph@digium.com>
+Submitted-by: George Joseph <gjoseph@digium.com>
+Submitted-at: Fri, 22 Oct 2021 09:33:44 -0500
+Reviewed-on: https://gerrit.asterisk.org/c/asterisk/+/16627
+Project: asterisk
+Branch: refs/heads/master