Fix z-order syntax

[camillek-db]

What are you changing in this pull request and why?

This PR fixes the syntax for https://docs.databricks.com/en/sql/language-manual/delta-optimize.html

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 new pages (delete if not applicable):

• Add page to website/sidebars.js
• Provide a unique filename for the new page

Removing or renaming existing pages (delete if not applicable):

• Remove page from website/sidebars.js
• Add an entry website/static/_redirects
• Run link testing locally with npm run build to update the links that point to the deleted page

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Name	Status	Preview	Comments	Updated (UTC)
docs-getdbt-com	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 14, 2023 1:11pm

[mirnawong1]

hey @camillek-db thanks so much for opening this up -- will get this merged for you!