Where is the description of existing roles?

I am trying to understand what permissions are given by client roles defined in realm-management. But there are no descriptions to tell me what each one of these roles allow.

For example, I tried to setup a user that could create new clients within a realm. I found out that the role create-client does not allow my user to create new clients, instead I have to use manage-clients.

Where can I find the description of all these roles?