Documentation: snapshot can be requested from one etcd node only
Updated Snapshot section of demo.md to reflect that snapsot can be requested only from one etcd node at a time.
Fixes
@@ -271,7 +271,10 @@ etcdctl --endpoints=$ENDPOINTS endpoint health
<img src="https://storage.googleapis.com/etcd/demo/11_etcdctl_snapshot_2016051001.gif" alt="11_etcdctl_snapshot_2016051001"/>
+Snapshot can only be requested from one etcd node, so `--endpoints` flag should contain only one endpoint.
+
```
+ENDPOINTS=$HOST_1:2379
etcdctl --endpoints=$ENDPOINTS snapshot save my.db
Snapshot saved at my.db
