Add example for Statistics View Roles

[nepa]

In the settings there is a "Permissions" tab, where one can define "Statistics View Roles".

However, there is no example for valid roles and how to write them. What are the default roles of WordPress and how do I name them? Do they have identifiers (admin, editor, ...) or can I use the translations that are shown in user management (Administrator, Redakteur, ...)? Do I write "admin" or "Admin" etc.

It would be nice, if the hint below the text field would give either an example or a list of role names that can be used.