[UPDATED DOC] PlanetScale environment set up

[appsbytom]

Which doc needs updating?

https://docs.planetscale.com/concepts/planetscale-environment-setup

Why is this needed?

The 'Installation via binary' should be formatted similarly to 'Manually'

Urgency

N/A

Additional resources

N/A

Point of contact

Who should we reach out to when we begin working on the doc? Is there anyone in particular that should review it?