[zh] Fix Markdown format

content/zh/docs/reference/access-authn-authz/rbac.md

@@ -50,7 +50,7 @@ kube-apiserver --authorization-mode=Example,RBAC --<其他选项> --<其他选
 The RBAC API declares four kinds of Kubernetes object: _Role_, _ClusterRole_,
 _RoleBinding_ and _ClusterRoleBinding_. You can
 [describe objects](/docs/concepts/overview/working-with-objects/kubernetes-objects/#understanding-kubernetes-objects),
-or amend them, using tools such as `kubectl,` just like any other Kubernetes object.
+or amend them, using tools such as `kubectl`, just like any other Kubernetes object.
 
 -->
 ## API 对象  {#api-overview}