Update docs

docs/ikev2-howto-zh.md

@@ -111,6 +111,7 @@ Options:
   --exportclient [client name]  export configuration for an existing client
   --listclients                 list the names of existing clients
   --revokeclient [client name]  revoke a client certificate
+  --deleteclient [client name]  delete a client certificate
   --removeikev2                 remove IKEv2 and delete all certificates and keys from the IPsec database
   -h, --help                    show this help message and exit
 
@@ -558,6 +559,12 @@ sudo ikev2.sh --exportclient [client name]
 
 如果要删除一个客户端证书：
 
+```bash
+sudo ikev2.sh --deleteclient [client name]
+```
+
+或者，你也可以手动删除一个客户端证书：
+
 1. 列出 IPsec 证书数据库中的证书：
 
    ```bash

docs/ikev2-howto.md

@@ -111,6 +111,7 @@ Options:
   --exportclient [client name]  export configuration for an existing client
   --listclients                 list the names of existing clients
   --revokeclient [client name]  revoke a client certificate
+  --deleteclient [client name]  delete a client certificate
   --removeikev2                 remove IKEv2 and delete all certificates and keys from the IPsec database
   -h, --help                    show this help message and exit
 
@@ -560,6 +561,12 @@ First, read the important note above. Then click here for instructions.
 
 To delete a client certificate:
 
+```bash
+sudo ikev2.sh --deleteclient [client name]
+```
+
+Alternatively, you can manually delete a client certificate:
+
 1. List certificates in the IPsec database:
 
    ```bash