Update notes for submitted changes

* func_volume: Add read capability to function.

03/3c2a22839698be0c0f54419169c76c4eac6046

@@ -0,0 +1,9 @@
+Code-Review+1: Joshua Colp <jcolp@sangoma.com>
+Code-Review+1: Benjamin Keith Ford <bford@digium.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: Wed, 26 May 2021 11:25:23 -0500
+Reviewed-on: https://gerrit.asterisk.org/c/asterisk/+/15915
+Project: asterisk
+Branch: refs/heads/18