[docs] Fix the missing brackets in java-client.md (#1240)

Author: ZmmBigdata

website/docs/apis/java-client.md

@@ -86,7 +86,7 @@ Admin admin = connection.getAdmin();
 admin.listDatabases().get().forEach(System.out::println);
 
 // obtain Table instance from the Connection
-Table table = connection.getTable(TablePath.of("my_db", "my_table");
+Table table = connection.getTable(TablePath.of("my_db", "my_table"));
 System.out.println(table.getTableInfo());
 ```