only use --server, provide example

acme.sh

@@ -4851,7 +4851,7 @@ Parameters:
   --useragent                       Specifies the user agent string. it will be saved for future use too.
   --accountemail                    Specifies the account email for registering, Only valid for the '--install' command.
   --accountkey                      Specifies the account key path, Only valid for the '--install' command.
-  --apiurl, --server, -s [acme api URL]   Specifies the particular acme api endpoint to use
+  --server [acme api url]           Specifies the particular acme api endpoint to use (e.g. https://acme-v01.api.letsencrypt.org)
   --days                            Specifies the days to renew the cert when using '--issue' command. The max value is $MAX_RENEW days.
   --httpport                        Specifies the standalone listening port. Only valid if the server is behind a reverse proxy or load balancer.
   --tlsport                         Specifies the standalone tls listening port. Only valid if the server is behind a reverse proxy or load balancer.
@@ -5271,7 +5271,7 @@ _process() {
         ACCOUNT_KEY_PATH="$_accountkey"
         shift
         ;;
-      --apiurl | --server | -s)
+      --server)
         _apiurl="$2"
         API="$_apiurl"
         shift