Update setup.md

[peno64]

Add a checklist if notifications don't appear in android auto

Proposed change

Type of change

• Document existing features within Home Assistant Companion App
• Document new or changing features for which there is an existing pull request elsewhere
• Spelling or grammatical corrections, or rewording for improved clarity
• Changes to the backend of this documentation
• Remove stale or deprecated documentation

Checklist

• I have read and followed the documentation guidelines.
• I have verified that my changes render correctly in the documentation.

Additional information

• This PR fixes or closes issue: Fixes #
• Link to relevant existing code or pull request:

[jpelgrom]

Thanks for the suggestion! I think this was because you couldn't find the notifications in your interface?

There is some overlap with the Android Auto notifications page, especially if #1397 is merged. I'm also having trouble determining what the value should be based on these steps. Do you think the update of the other page would be enough? If not, can you rewrite the steps like others to clarify what is expected ("Check that x is y")?

[peno64]

@jpelgrom
I updated the PR with your suggestions and extended the checks.
I would apply the changes in both places