Add paid plan requirement for custom domains (#6238)
Add paid plan requirement for custom domains (#6238)

The custom domains settings UI for free accounts informs you that you need a paid account, but no mention is made of this in the documentation.
auth0/docs,jeffreylees/docs,yvonnewilson/docs,jeffreylees/docs,yvonnewilson/docs,auth0/docs,jeffreylees/docs,auth0/docs,yvonnewilson/docs