add to our yaml style best practice guide

[runleonarun]

Closes #1686

What are you changing in this pull request and why?

• added that a YAML list is accepted as a string.
• Not adding a new page because winnie did this amazing best practice guide after this issue was filed.

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-runleonarun-patch-16-dbt-labs.vercel.app/best-practices/how-we-style/5-how-we-style-our-yaml

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