Document dataproc_batch field for configuring Dataproc Serverless jobs

[MichaelHeinecke]

Resolves #3382

What are you changing in this pull request and why?

The dataproc_batch config field for configuring Python models running on GCP Dataproc Serverless was added in dbt-labs/dbt-bigquery#578, but it isn't documented yet. This PR adds the missing documentation for this field.

Checklist

• Review the Content style guide and About versioning so my content adheres to these guidelines.
• Add a checklist item for anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."

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[mirnawong1]

hey @MichaelHeinecke , thanks for opening this pr up to resolve issue 3382. this looks good to me, will go ahead and approve + merge ✨

[MichaelHeinecke]

@mirnawong1

Thanks for the swift review!

There was a broken link causing the netlify checks to fail - sorry for that. I just fixed that.

Could you please take another look?

[mirnawong1]

hey @MichaelHeinecke thanks for fixing that link up! good to go and merging this for you now ✨