4958969: ObjectOutputStream example leads to non-working code

Reviewed-by: lancea, naoto

src/java.base/share/classes/java/io/ObjectOutputStream.java

@@ -66,32 +66,29 @@ import sun.reflect.misc.ReflectUtil;
  * written.
  *
  * <p>For example to write an object that can be read by the example in
- * ObjectInputStream:
- * <br>
- * <pre>
- *      FileOutputStream fos = new FileOutputStream("t.tmp");
- *      ObjectOutputStream oos = new ObjectOutputStream(fos);
- *
- *      oos.writeInt(12345);
- *      oos.writeObject("Today");
- *      oos.writeObject(new Date());
- *
- *      oos.close();
- * </pre>
+ * {@link ObjectInputStream}:
+ * {@snippet lang="java":
+ *      try (FileOutputStream fos = new FileOutputStream("t.tmp");
+ *           ObjectOutputStream oos = new ObjectOutputStream(fos)) {
+ *          oos.writeObject("Today");
+ *          oos.writeObject(LocalDateTime.now());
+ *      } catch (Exception ex) {
+ *          // handle exception
+ *      }
+ * }
  *
  * <p>Serializable classes that require special handling during the
  * serialization and deserialization process should implement methods
  * with the following signatures:
  *
- * <br>
- * <pre>
- * private void readObject(java.io.ObjectInputStream stream)
- *     throws IOException, ClassNotFoundException;
- * private void writeObject(java.io.ObjectOutputStream stream)
- *     throws IOException
- * private void readObjectNoData()
- *     throws ObjectStreamException;
- * </pre>
+ * {@snippet lang="java":
+ *     private void readObject(java.io.ObjectInputStream stream)
+ *         throws IOException, ClassNotFoundException;
+ *     private void writeObject(java.io.ObjectOutputStream stream)
+ *         throws IOException;
+ *     private void readObjectNoData()
+ *         throws ObjectStreamException;
+ * }
  *
  * <p>The method name, modifiers, return type, and number and type of
  * parameters must match exactly for the method to be used by