Added description section to data tests doc

[nataliefiann]

What are you changing in this pull request and why?

I have created this PR following a request from Karanke who reported a user queried how to add a description to data tests (generic / singular) in the community slack.

Checklist

• I have reviewed the Content style guide so my content adheres to these guidelines.
• The topic I'm writing about is for specific dbt version(s) and I have versioned it according to the version a whole page and/or version a block of content guidelines.
• I have added checklist item(s) to this list for anything anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."
• The content in this PR requires a dbt release note, so I added one to the release notes page.

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🚀 Deployment available! Here are the direct links to the updated files:

• https://docs-getdbt-com-git-nfiann-description-datatests-dbt-labs.vercel.app/reference/data-test-configs

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Name	Status	Preview	Updated (UTC)
docs-getdbt-com	✅ Ready (Inspect)	Visit Preview	Feb 6, 2025 2:10pm

[aranke]

Thanks for jumping on this, @nataliefiann!

Can we add an example for description to the "Property file" sections also, please?
Otherwise LGTM 😄

[nataliefiann]

Thanks for jumping on this, @nataliefiann!

Can we add an example for description to the "Property file" sections also, please? Otherwise LGTM 😄

[nataliefiann]

Hiya @aranke

Thanks so much for reviewing this. I added some examples at the bottom of the page. Would you like me to use these examples under the Profile tab or a new one?

Kind Regards
Natalie