Update notes for submitted changes

* res_musiconhold: Clarify that playlist mode only supports HTTP(S) URLs

a6/8e33d91b621920086e0ace567f4408d98f356e

@@ -0,0 +1,8 @@
+Code-Review+1: Benjamin Keith Ford <bford@digium.com>
+Code-Review+2: George Joseph <gjoseph@digium.com>
+Verified+2: Friendly Automation
+Submitted-by: Friendly Automation
+Submitted-at: Mon, 28 Sep 2020 13:20:32 -0500
+Reviewed-on: https://gerrit.asterisk.org/c/asterisk/+/14991
+Project: asterisk
+Branch: refs/heads/17