Basic: tweak comment

Add a missing surrounding brace for doxygen group.  This messes with pair
jumping in vim and is annoying.  NFC.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@222155 91177308-0d34-0410-b5e6-96231b3b80d8
test/Driver/cl-outputs.c: tweak some check prefixes; NFC.

These tests deal with the /o option; rename to better reflect that.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@222157 91177308-0d34-0410-b5e6-96231b3b80d8