[rb] Update deprecation message for local_driver.rb

[luke-hill]

Makes it a little clearer what exactly needs to be replaced and for what

Description

Improve the deprecation notice when using something that isn't ideal (Such as the old capabilities: [options, desired_capabilities] parameter

Motivation and Context

It wasn't directly clear what needed altering. Once I knew what to alter, the change worked almost immediately

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.