Consider pointing to the edge PPA on "installing authd" page of the edge-docs

[adombeck]

The edge-docs document features which are not available yet in the latest stable release but are already available in the edge PPA. However, the documentation to install authd still tells you to install authd from the stable PPA. That can be confusing. Maybe we should point to the edge PPA instead or show a note.

[adombeck]

Cc @edibotopic

[edibotopic]

Agreed. Happy to default to edge PPA in the edge docs.

We have instructions for switching between edge and stable PPA in the Changing authd Versions page, so perhaps we can link to that too.

[edibotopic]

@adombeck --- I made UDENG-9457 to track this. Will do it soon.