Use connection string in user certificate sample

Author: w1am

db-client-java/src/test/java/com/eventstore/dbclient/samples/authentication/UserCertificate.java

@@ -2,16 +2,13 @@
 
 import com.eventstore.dbclient.EventStoreDBClient;
 import com.eventstore.dbclient.EventStoreDBClientSettings;
+import com.eventstore.dbclient.EventStoreDBConnectionString;
 
 public class UserCertificate {
     private static void tracing() {
         // region client-with-user-certificates
-        EventStoreDBClientSettings settings = EventStoreDBClientSettings.builder()
-                .tls(true)
-                .defaultClientCertificate("/path/to/ca.crt", "/path/to/ca.key")
-                .defaultCredentials("admin", "changeit")
-                .buildConnectionSettings();
-
+        EventStoreDBClientSettings settings = EventStoreDBConnectionString
+                .parseOrThrow("esdb://admin:changeit@{endpoint}?tls=true&userCertFile={pathToCaFile}&userKeyFile={pathToKeyFile}");
         EventStoreDBClient client = EventStoreDBClient.create(settings);
         // endregion client-with-user-certificates
     }