Merge pull request #269 from mikulely/patch-2

fix typos

Author: rootsongjc

concepts/apiservice.md

@@ -98,7 +98,7 @@ v1beta2.apps                             2d
 v2beta1.autoscaling                      2d
 ```
 
-另外查看当前kubernetes集群支持的API版本还可以使用`kubectl api-version`：
+另外查看当前kubernetes集群支持的API版本还可以使用`kubectl api-versions`：
 
 ```bash
 $ kubectl api-versions
@@ -131,4 +131,4 @@ v1
 
 [API  Conventions](https://github.com/kubernetes/community/blob/master/contributors/devel/api-conventions.md#resources)
 
-[Kuberentes1.8 reference doc](https://kubernetes.io/docs/api-reference/v1.8/#apiservicespec-v1beta1-apiregistration)
+[Kuberentes1.8 reference doc](https://kubernetes.io/docs/api-reference/v1.8/#apiservicespec-v1beta1-apiregistration)