This type is used to define a Table of Content and it will be displayed on the left side of the current article.
Once you create a TOC page the convention is to detail the TOC beginning with a horizontal line and then detail the content with a list of bullets.
For example take the following TOC page
There is some introductory text; then the start of the TOC section with the HR tag (horizontal line) and then a list of bullets; during execution you will see the following:
Notice the left-side is a tree and you can navigate directly from there.
Check here a real world Table Of Contents.