docs: Update docs for `theme_overrides` setting (#41038)
This PR updates the docs to reference the `theme_overrides` setting
instead of the old `experimental.theme_overrides` setting.
Release Notes:
- N/A
d83ed4e03eMarshall Bowers committed on 10/23/2025, 5:52:35 PM· committed by GitHubparent11eba64