Fix changelog for !767 and !794

These changes did not make it into the 7.12.0 release. The entry for
!794 is already correctly listed for 7.12.1 so it has been removed.

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 v 7.13.0 (unreleased)
+  - Fix external issue tracker hook/test for HTTPS URLs (Daniel Gerhardt)
   - Fix order of issues imported form GitHub (Hiroyuki Sato)
   - Bump rugments to 1.0.0beta8 to fix C prototype function highlighting (Jonathon Reinhart)
   - Fix Merge Request webhook to properly fire "merge" action when accepted from the web UI
@@ -44,12 +45,10 @@ v 7.12.0
   - Disable changing of target branch in new merge request page when a branch has already been specified (Stan Hu)
   - Fix post-receive errors on a push when an external issue tracker is configured (Stan Hu)
   - Update oauth button logos for Twitter and Google to recommended assets
-  - Fix hooks for web based events with external issue references (Daniel Gerhardt)
   - Update browser gem to version 0.8.0 for IE11 support (Stan Hu)
   - Fix timeout when rendering file with thousands of lines.
   - Add "Remember me" checkbox to LDAP signin form.
   - Add session expiration delay configuration through UI application settings
-  - Fix external issue tracker hook/test for HTTPS URLs (Daniel Gerhardt)
   - Don't notify users mentioned in code blocks or blockquotes.
   - Omit link to generate labels if user does not have access to create them (Stan Hu)
   - Show warning when a comment will add 10 or more people to the discussion.