Fix multiline links in javadoc and wrong linebreaking of <pre> bodies

[BarkingBad]

I decided to do that in one PR, because fixes implementation depends on same code sections

Multiline links

/**
 * Here comes some comment
 *
 * {@link example.SomeClassToLink#someFunc(int, Object) someName(ads,
 * dsa)}
 *
 * longer comment
 */
public class SomeJavaDocExample {
}

Pre tags bodies formatting

/**
 * <pre class="prettyprint">
 * class MyFragment extends Fragment {
 *   public MyFragment() {
 *     super(R.layout.fragment_main);
 *   }
 * }
 * </pre>
 */

[kamildoleglo]

Let's add data-unresolved-dri-link instead for unresolved elements

[MarcinAman]

to do that we would need to have a dri for that, which in this case is not possible