Clarify ssh-keys commands to run when adding ssh keys in docker-based installation

[cabaalexander]

Description of problem

Here on the readme it says:

...run the appropriate ssh-keys commands.

And I wonder what are those appropriate ssh-keys commands, is there any link that can be appended here ? And is it accurate regarding running dokku within docker ?

Steps to reproduce

Check docs

dokku report $APP_NAME

Check docs

Additional information

No response

Output of failing commands after running: dokku trace:off

No response

Output of failing commands after running: dokku trace:on

No response

[josegonzalez]

The docs in the docs folder link out to the user management docs in the next line:

Please see the [user management documentation](https://github.com/dokku/dokku/blob/master/docs/deployment/user-management.md) for more information.

Since you're looking at the docs in source code mode, that link doesn't appear. If you go to the preview:

You'll see they are linked:

Our docs site also has it linked properly.

That said, we can probably include a better example before linking users off to the correct page.