put noisy "unknown command tag name"  warning
under -Wdocumentation-unknown-command and off by default.
patch by Dmitri Gribenko.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181487 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed