multi: Remove peer_id from RPC commands

docker/README.md

@@ -123,7 +123,6 @@ alice$ lncli listpeers
     "peers": [
         {
             "pub_key": "0343bc80b914aebf8e50eb0b8e445fc79b9e6e8e5e018fa8c5f85c7d429c117b38",
-            "peer_id": 1,
             "address": "172.19.0.4:9735",
             "bytes_sent": "357",
             "bytes_recv": "357",
@@ -141,7 +140,6 @@ bob$ lncli listpeers
     "peers": [
         {
             "pub_key": "03d0cd35b761f789983f3cfe82c68170cd1c3266b39220c24f7dd72ef4be0883eb",
-            "peer_id": 1,
             "address": "172.19.0.3:51932",
             "bytes_sent": "357",
             "bytes_recv": "357",