Update lang ref.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_35@216950 91177308-0d34-0410-b5e6-96231b3b80d8
Update release notes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_35@216951 91177308-0d34-0410-b5e6-96231b3b80d8