Update notes for submitted changes

* futex: Make lookup_pi_state more robust
* futex: Always cleanup owner tid in unlock_pi
* futex: Validate atomic acquisition in futex_lock_pi_atomic()
* futex-prevent-requeue-pi-on-same-futex.patch futex: Forbid uaddr == uaddr2 in futex_requeue(..., requeue_pi=1)
* futex: Add another early deadlock detection check