Wrong cli command in example, simple fix (#4171)

* Update cli.md

* Update v-add-mail-domain-webmail

bin/v-add-mail-domain-webmail

@@ -2,9 +2,9 @@
 # info: add webmail support for a domain
 # options: USER DOMAIN [WEBMAIL] [RESTART] [QUIET]
 #
-# example: v-add-sys-webmail user domain.com
-# example: v-add-sys-webmail user domain.com snappymail
-# example: v-add-sys-webmail user domain.com roundcube
+# example: v-add-mail-domain-webmail user domain.com
+# example: v-add-mail-domain-webmail user domain.com snappymail
+# example: v-add-mail-domain-webmail user domain.com roundcube
 #
 # This function enables webmail client for a mail domain.
 

docs/docs/reference/cli.md

@@ -630,9 +630,9 @@ add webmail support for a domain
 **Examples**:
 
 ```bash
-v-add-sys-webmail user domain.com
-example: v-add-sys-webmail user domain.com snappymail
-example: v-add-sys-webmail user domain.com roundcube
+v-add-mail-domain-webmail user domain.com
+example: v-add-mail-domain-webmail user domain.com snappymail
+example: v-add-mail-domain-webmail user domain.com roundcube
 ```
 
 This function enables webmail client for a mail domain.