Remove extraneous attribute number.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176053 91177308-0d34-0410-b5e6-96231b3b80d8
Fix wording.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176055 91177308-0d34-0410-b5e6-96231b3b80d8