Update phab docs to clarify how to accept a change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175047 91177308-0d34-0410-b5e6-96231b3b80d8
Use array_pod_sort.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175048 91177308-0d34-0410-b5e6-96231b3b80d8