fixed some typos in comments


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212423 91177308-0d34-0410-b5e6-96231b3b80d8
fixed typos in comments


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212424 91177308-0d34-0410-b5e6-96231b3b80d8