Update notes for submitted changes

* app_mp3: remove 10 seconds of silence after mp3 playback

bb/0ce22b2bc4350f96c3dc183e9a0598fc2e1fc7

@@ -0,0 +1,9 @@
+Code-Review+1: Benjamin Keith Ford <bford@digium.com>
+Code-Review+1: Richard Mudgett <rmudgett@digium.com>
+Code-Review+2: Joshua Colp <jcolp@digium.com>
+Verified+2: Jenkins2
+Submitted-by: Jenkins2
+Submitted-at: Mon, 18 Jun 2018 07:33:45 -0500
+Reviewed-on: https://gerrit.asterisk.org/9190
+Project: asterisk
+Branch: refs/heads/13