etcdctl: Fix migrate example in README.md

etcdctl/README.md

@@ -1214,7 +1214,7 @@ The provided transformer should read until EOF and flush the stdout before exiti
 #### Example
 
 ```
-./etcdctl --data-dir=/var/etcd --transformer=k8s-transformer
+./etcdctl migrate --data-dir=/var/etcd --transformer=k8s-transformer
 # finished transforming keys
 ```
 
@@ -1284,4 +1284,4 @@ backward compatibility for `JSON` format and the format in non-interactive mode.
 [v3key]: ../mvcc/mvccpb/kv.proto#L12-L29
 [etcdrpc]: ../etcdserver/etcdserverpb/rpc.proto
 [storagerpc]: ../mvcc/mvccpb/kv.proto
-[member_list_rpc]: ../etcdserver/etcdserverpb/rpc.proto#L493-L497
+[member_list_rpc]: ../etcdserver/etcdserverpb/rpc.proto#L493-L497