Update doc to reflect new restriction on "Authorized Domains".
Update doc to reflect new restriction on "Authorized Domains".

It is no longer possible to specify a subdomain (eg www.endpoints....) in the Authorized Domains. Instead, you must specify the top-level domain, and all subdomains will be authorized.

Change-Id: I3285920e5f239707dde102b47fc0a204f02e2785
GitOrigin-RevId: f232dc6a4d6782e2add7118b4948d383b19a3d11

googlecloudrobotics/core,googlecloudrobotics/core,googlecloudrobotics/core