fix,kubectl apply cmd in quick start doc (#15)

Signed-off-by: liuzhenwei <[email protected]>

Author: diannaowa

docs/getting-started.md

@@ -84,7 +84,7 @@ spec:
 ```bash
 # You can configure the ShardingConfig according to your requirements.
 # Apply shardingconfig
-$ kubectl apply shardingconfig.yaml
+$ kubectl apply -f shardingconfig.yaml
 
 # Waiting for pods to be recreate and ready.
 # The mesh-proxy container will be automatically injected into the pod.