On this tab (fig. 1) you can configure the data, displayed on the Documentation tab.
Fig. 1. User object page. "Documentation" tab with checked box
Use displayed name and description for documentation – automatically display the object name and description on the Documentation tab. This box is checked by default.
When the box is unchecked, the Documentation tab (fig. 2) displays the field for adding tags with additional description of the object.
Fig. 2. User object page. "Documentation" tab with unchecked box