[docs] Update current status.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@203188 91177308-0d34-0410-b5e6-96231b3b80d8
[docs] Option parsing driver work is pretty much done.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@203189 91177308-0d34-0410-b5e6-96231b3b80d8