Avoid the -Wdocumentation-unknown-command warning in Clang's C API docs
Avoid the -Wdocumentation-unknown-command warning in Clang's C API docs

rdar://20441985

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@299650 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 3a677b92ae3d038b3a9b1d16fd63faec87c5b901)

apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang