Fixup for r182715: provide correct arg to --gtest-filter

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182758 91177308-0d34-0410-b5e6-96231b3b80d8
Adding ReleaseProcess doc

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182759 91177308-0d34-0410-b5e6-96231b3b80d8