Fix two typos in comments. No functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@198243 91177308-0d34-0410-b5e6-96231b3b80d8
Update DataRecursiveASTVisitor so that it visits attributes.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@198249 91177308-0d34-0410-b5e6-96231b3b80d8