git: openjdk/jtharness: (tutorial) fixed few javadoc issues

[Dmitry Bessonov]

Changeset: b4eda3b0
Author:    Dmitry Bessonov <dbessono at openjdk.org>
Date:      2020-10-12 11:58:17 +0000
URL:       https://git.openjdk.java.net/jtharness/commit/b4eda3b0

(tutorial) fixed few javadoc issues

! examples/tutorial/demoapi/src/com/sun/demoapi/BigNum.java
! examples/tutorial/demoapi/src/com/sun/demoapi/lists/DoublyLinkedList.java
! examples/tutorial/demoapi/src/com/sun/demoapi/lists/LinkedList.java
! examples/tutorial/demoapi/src/com/sun/demoapi/lists/SortedList.java