fix cut and paste error in new example in JdbcLongVarCharTest.java

Change-Id: I91e568896b1674e97cdf18eacc21538093765bd9

connectivity/qa/complex/connectivity/JdbcLongVarCharTest.java

@@ -60,7 +60,7 @@ public class JdbcLongVarCharTest extends ComplexTestCase
             /* Get URL from environment variable.
             *
             * Example URL:
-            * jdbc:mysql://localhost:3306/mysql?user=username?password=password
+            * jdbc:mysql://localhost:3306/mysql?user=username&password=password
             */
             String url = System.getenv("CONNECTIVITY_TEST_MYSQL_DRIVER_JDBC");
             com.sun.star.beans.PropertyValue prop[] = new PropertyValue[1];
@@ -122,4 +122,4 @@ public class JdbcLongVarCharTest extends ComplexTestCase
             System.exit(0);
         }
     }
-}
+}
\ No newline at end of file