doc: use 2379 as port of the first member in local cluster

Documentation/dev-guide/local_cluster.md

@@ -37,7 +37,7 @@ $ goreman -f Procfile start
 ...
 ```
 
-The started members listen on `localhost:12379`, `localhost:22379`, and `localhost:32379` for client requests respectively.
+The started members listen on `localhost:2379`, `localhost:22379`, and `localhost:32379` for client requests respectively.
 
 To interact with the started cluster by using etcdctl:
 
@@ -49,12 +49,12 @@ $ etcdctl --write-out=table --endpoints=localhost:12379 member list
 +------------------+---------+--------+------------------------+------------------------+
 |        ID        | STATUS  |  NAME  |       PEER ADDRS       |      CLIENT ADDRS      |
 +------------------+---------+--------+------------------------+------------------------+
-| 8211f1d0f64f3269 | started | infra1 | http://127.0.0.1:12380 | http://127.0.0.1:12379 |
+| 8211f1d0f64f3269 | started | infra1 | http://127.0.0.1:2380  | http://127.0.0.1:2379  |
 | 91bc3c398fb3c146 | started | infra2 | http://127.0.0.1:22380 | http://127.0.0.1:22379 |
 | fd422379fda50e48 | started | infra3 | http://127.0.0.1:32380 | http://127.0.0.1:32379 |
 +------------------+---------+--------+------------------------+------------------------+
 
-$ etcdctl --endpoints=localhost:12379 put foo bar
+$ etcdctl put foo bar
 OK
 ```
 
@@ -64,10 +64,10 @@ To exercise etcd's fault tolerance, kill a member:
 # kill etcd2
 $ goreman run stop etcd2
 
-$ etcdctl --endpoints=localhost:12379 put key hello
+$ etcdctl put key hello
 OK
 
-$ etcdctl --endpoints=localhost:12379 get key
+$ etcdctl get key
 hello
 
 # try to get key from the killed member