enh: remove useless perperties from java sample code

docs-examples/java/src/main/java/com/taos/example/RESTConnectExample.java

 package com.taos.example;
 
-import com.taosdata.jdbc.TSDBDriver;
-
 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.SQLException;
-import java.util.Properties;
 
 public class RESTConnectExample {
     // ANCHOR: main
     public static void main(String[] args) throws SQLException {
         String jdbcUrl = "jdbc:TAOS-RS://localhost:6041?user=root&password=taosdata";
-        Properties connProps = new Properties();
-        connProps.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
-        Connection conn = DriverManager.getConnection(jdbcUrl, connProps);
+        Connection conn = DriverManager.getConnection(jdbcUrl);
         System.out.println("Connected");
         conn.close();
     }