Fix same line doxycomments so they comment the adjacent field.

Without the '<' prefix in the doxycomment these comments were incorrectly
attached to the proceeding comment on the next line, rather than the
preceeding one.

Fixes PR12722

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@155993 91177308-0d34-0410-b5e6-96231b3b80d8