docs: release notes for the v11.2.16 release
docs: release notes for the v11.2.16 release

Put the new release notes underneath the latest stable version so users don't think this LTS release is actually the latest.

angular/angular-cli,clydin/angular-cli,geofffilippi/angular-cli,catull/angular-cli,angular/angular-cli,geofffilippi/angular-cli,clydin/angular-cli,Brocco/angular-cli,Brocco/angular-cli,geofffilippi/angular-cli,angular/angular-cli,clydin/angular-cli,catull/angular-cli,geofffilippi/angular-cli,catull/angular-cli,Brocco/angular-cli,Brocco/angular-cli,Brocco/angular-cli,catull/angular-cli,clydin/angular-cli,angular/angular-cli