docs: Update Logger documentation to remove Pretty Printing options

[dthyresson]

As part of https://github.com/redwoodjs/redwood/pull/3947, the Redwood logger no longer supports Pino's prettyPrint option in dev.

Note: this may be a breaking change but important for v1 as Pino v7 is deprecating it.

To document:

• how to change your options
• how to prettyPrint in dev
• how to pretty print in dev with serve api