Update notes for submitted changes

* doc: Fix CHANGES entries to have .txt suffix and update READMEs

74/16703f04f12eb583a3427a3f64d06951c18c6e

@@ -0,0 +1,9 @@
+Code-Review+1: Joshua Colp <jcolp@sangoma.com>
+Code-Review+1: Kevin Harwell <kharwell@digium.com>
+Code-Review+2: Friendly Automation
+Verified+2: Friendly Automation
+Submitted-by: Friendly Automation
+Submitted-at: Fri, 07 Feb 2020 14:04:45 -0600
+Reviewed-on: https://gerrit.asterisk.org/c/asterisk/+/13734
+Project: asterisk
+Branch: refs/heads/certified/16.8