[KYUUBI apache#5347] [DOCS] Fix java code errors in quick_start_with_…

…jdbc

### _Why are the changes needed?_

There were obvious errors in the case code, so these cases were fixed.

### _How was this patch tested?_

Just fix case code, no test need. Of course, I have run the case code and have confirmed that there is no problem.

Closes apache#5347 from mrtisttt/fix-hive-jdbc-example-code.

Closes apache#5347

ec6ecf7 [mrtisttt] [DOCS] Fix java code errors in quick_start_with_jdbc

Authored-by: mrtisttt <mrtisttt@126.com>
Signed-off-by: Fu Chen <cfmcgrady@gmail.com>

docs/quick_start/quick_start_with_jdbc.md

@@ -50,7 +50,7 @@ public class KyuubiJDBC {
   public static void main(String[] args) throws SQLException {
     try (Connection conn = DriverManager.getConnection(kyuubiJdbcUrl)) {
       try (Statement stmt = conn.createStatement()) {
-        try (ResultSet rs = st.executeQuery("show databases")) {
+        try (ResultSet rs = stmt.executeQuery("show databases")) {
           while (rs.next()) {
             System.out.println(rs.getString(1));
           }
@@ -79,11 +79,11 @@ public class KyuubiJDBCDemo {
   public static void main(String[] args) throws SQLException {
     String clientPrincipal = args[0]; // Kerberos principal
     String clientKeytab = args[1];    // Keytab file location
-    String serverPrincipal = arg[2];  // Kerberos principal used by Kyuubi Server
+    String serverPrincipal = args[2]; // Kerberos principal used by Kyuubi Server
     String kyuubiJdbcUrl = String.format(kyuubiJdbcUrlTemplate, clientPrincipal, clientKeytab, serverPrincipal);
     try (Connection conn = DriverManager.getConnection(kyuubiJdbcUrl)) {
       try (Statement stmt = conn.createStatement()) {
-        try (ResultSet rs = st.executeQuery("show databases")) {
+        try (ResultSet rs = stmt.executeQuery("show databases")) {
           while (rs.next()) {
             System.out.println(rs.getString(1));
           }