Update distributed_locks.md: add new Ruby Implementation for Distributed Locks
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Update
distributed_locks.md: add new Ruby Implementation for Distributed LocksAdded new ruby implementation of Redis Distributed Locks
redis_queued_locksto the Implementations list.The new implementation realizes "lock request queues" feature.
Repository: https://github.com/0exp/redis_queued_locks
(This PR is a clone of the PR to the old docs: redis/redis-doc#2706)