Update documentation on yml version defaults

[LeoTheGriff]

What are you changing in this pull request and why?

The config-version documentation is not clear about what the default value is. It states that the parameter is optional and that the old version, version 1, is not in use. This implies that the default version should be 2, but the default is explicitly stated here as version 1.

## Default
Without this configuration, dbt will assume your dbt_project.yml uses the version 1 syntax, which was deprecated in dbt v0.19.0.

As per PR https://github.com/dbt-labs/dbt-core/pull/7060, the default version is in-fact version 2, so this documentation needs to be updated.

Checklist

• [x] Review the Content style guide so my content adheres to these guidelines.
• [x] For docs versioning, review how to version a whole page and version a block of content.
• [x] 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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Name	Status	Preview	Comments	Updated (UTC)
docs-getdbt-com	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 19, 2024 9:37am

[LeoTheGriff]

I assume the PRs that are failing are to do with managing PRs, not to functionality. Please let me know if any actions are required from me.