Improve CHANGELOG.md by mentioning a new feature and pointing to the release branch

5 jobs for !2762 with bernd-master-patch-25084
latest detached
Status Name Job ID Coverage
  Trigger
manual full-dune-2.7-clang
manual full-dune-2.7-gcc
manual full-dune-master-gcc
manual minimal-dune-2.7-gcc
 
  Downstream Modules
created trigger lecture