Update CHANGELOG-EE

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CHANGELOG-EE

+Please view this file on the master branch, on stable branches it's out of date.
+
 v 8.5.0 (unreleased)
   - Show warning when mirror repository default branch could not be updated because it has diverged from upstream.
 
 v 8.4.2
   - Elasticsearch indexer performance improvements
-  - Don't redirect away from Mirror Repository settings when repo is empty.
-v 8.4.2 (unreleased)
+  - Don't redirect away from Mirror Repository settings when repo is empty
   - Fix updating of branches in mirrored repository
-
-v 8.4.2
+  - Fix a 500 error preventing LDAP users with 2FA enabled from logging in
   - Rake task gitlab:elastic:index_repositories handles errors and shows progress
-
-v 8.4.2
-  - Partial indexing of repo on push (indexing changes only).
+  - Partial indexing of repo on push (indexing changes only)
 
 v 8.4.1
   - No EE-specific changes