Update how-to-create-locks.md

Part of KubeCon EU 24 doc sprint

#794

content/en/docs/v3.6/tutorials/how-to-create-locks.md

@@ -4,13 +4,22 @@ description: Guide to creating distributed locks in etcd
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+LOCK acquires a distributed mutex with a given name. Once the lock is acquired, it will be held until etcdctl is terminated.
+
+## Prerequisites
+
+* Install [`etcd` and `etcdctl`](https://etcd.io/docs/v3.6/install/)
+
+## Creating a lock
+
 `lock` for distributed lock:
 
 ![08_etcdctl_lock_2016050501](https://storage.googleapis.com/etcd/demo/08_etcdctl_lock_2016050501.gif)
 
 ```shell
 etcdctl --endpoints=$ENDPOINTS lock mutex1
-
-# another client with the same name blocks
-etcdctl --endpoints=$ENDPOINTS lock mutex1
 ```
+
+### Options
+- endpoints - defines a comma-delimited list of machine addresses in the cluster.
+- ttl - time out in seconds of lock session.