Update warnings.md

[tjirab]

What are you changing in this pull request and why?

Small clarification that values should be passed on as arrays. Previously (dbt 1.7.x) this worked but from 1.8.x. this no longer seems to be the case.

Checklist

• [ ] Review the Content style guide so my content adheres to these guidelines.
• [ ] For docs versioning, review how to version a whole page and version a block of content.
• [ ] Add a checklist item for anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."

Adding or removing pages (delete if not applicable):

• [ ] Add/remove page in website/sidebars.js
• [ ] Provide a unique filename for new pages
• [ ] Add an entry for deleted pages in website/vercel.json
• [ ] Run link testing locally with npm run build to update the links that point to deleted pages

[vercel[bot]]

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