Specify whether to generate hyperlink titles.

In HTML, hyperlink titles are specified using `title` attribute, like this:

  `<a ... title="link tooltip text"> ... </a>`

Most browsers will interpret it as a hyperlink tooltip (a tiny window with the text that appears near the hyperlink when the mouse cursor is moved over it).

Such tooltips can be used to quickly see additional information about the linked text. For instance, when the link appears on a Java class name, its tooltip may reveal what kind of class it is (e.g. ordinary class, interface, enum or annotation type) and which package it belongs to.