[API] Pref layout.css-properties-values-api enabled on nightly

[bsmth]

Acceptance Criteria

• The listed features are documented sufficiently on MDN
• BCD is updated
• Interactive example and data repos are updated if appropriate
• The content has been reviewed as needed

For folks helping with Firefox related documentation

• Set bugs to dev-doc-complete
• Add entry to Firefox release notes if feature is enabled in release
• Add entry to Firefox experimental features page if feature is not yet enabled in release

Features to document

When landed, this should be mentioned in https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Experimental_features.

 # Whether Properties and Values is enabled
 - name: layout.css.properties-and-values.enabled
   type: RelaxedAtomicBool
-  value: false
+  value: @IS_NIGHTLY_BUILD@

Related Gecko bugs

• https://bugzilla.mozilla.org/show_bug.cgi?id=1840480

Other

• Check content open issues to see if any pertain to the subject matter. If there are any that can be closed because of the work, do so. If there are any that can be fixed relatively quickly because of the knowledge from completing this issue and you have time, feel free to go ahead and fix them.
• Check if glossary updates are required for the feature you're documenting - whether an existing term needs to be updated or a new term should be added.
• Check if BCD update means that content pages need to have experimental markup removed or deprecated markup added (front matter tags and macros).

Related issues and pull requests

• BCD relnote(116): CSSPropertyRule enabled in Fx nightly by default browser-compat-data#20346
• Content relnote(116): CSSPropertyRule and registerProperty() enabled in Fx nightly #27902

[bsmth]

Refers to enabling https://developer.mozilla.org/en-US/docs/Web/API/CSSPropertyRule

[bsmth]

Documented at https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Experimental_features#css_properties_and_values_api