Provide a page template for CSS data types

[yarusome]

MDN URL

https://developer.mozilla.org/en-US/docs/MDN/Writing_guidelines/Page_structures/Page_types#css_feature_reference_page

What specific section or headline is this issue about?

No response

What information was incorrect, unhelpful, or incomplete?

There's no page template for CSS data types, and the existing pages for data types are also quite disparate.

Specifically, it would be much better to have a guideline on the organization of the "Syntax", "Values", "Formal syntax", "Description", and "Interpolation" sections. (The "Description" section is rarely seen on pages for CSS properties, though.)

What did you expect to see?

1. A template for CSS data types in the "CSS feature reference page" section on the "Page type" page.
2. Accompanying updates to the "CSS reference syntax" section on the "Syntax sections" page.

Do you have any supporting links, references, or citations?

No response

Do you have anything more you want to share?

This blocks #26775.