CHANGELOG: move language section to the top of 2.14
CHANGELOG: move language section to the top of 2.14

Also apply new formatting style to dart format section

Change-Id: I5e7ad454ff2794dc98eb4f1868416beb45b1c68e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/206340
Auto-Submit: Kevin Moore <1d6e7d10d051cf619c5282da3c28fd8d3e0a65a4@google.com>
Reviewed-by: Bob Nystrom <afede3a9ebedb865bee78398feff6fbe97068f17@google.com>
Commit-Queue: Bob Nystrom <afede3a9ebedb865bee78398feff6fbe97068f17@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk