[Related Website Sets] Update warning at the top

[bershanskiy]

Description

Update warning with deprecation notice.

Motivation

Save developers' time.

Additional details

RWS stopped accepting new submissions and archived their repository in 2025:
GoogleChrome/related-website-sets@75210e7

Related issues and pull requests

[github-actions]

Preview URLs (1 page)

• /en-US/docs/Web/API/Storage_Access_API/Related_website_sets

[wbamberg]

This is interesting because the feature is deprecated along with much of the rest of the privacy sandbox (https://privacysandbox.google.com/blog/update-on-plans-for-privacy-sandbox-technologies) but because this is a guide page, it doesn't automatically get the deprecation notice (the corresponding API does: https://developer.mozilla.org/en-US/docs/Web/API/Document/requestStorageAccessFor , because it has BCD, which works to convey deprecation).

That's a bit of a maintenance problem because eventually we'll be able to remove all these privacy sandbox feature pages, but it's harder to track guide pages (so we can remember to remove them).

If it were me I would delete this guide page and instead link to https://privacysandbox.google.com/cookies/related-website-sets-integration when we need to (i.e. from from pages like https://developer.mozilla.org/en-US/docs/Web/API/Document/requestStorageAccessFor). I would also delete https://developer.mozilla.org/en-US/docs/Web/API/Storage_Access_API/Using#requesting_storage_access_from_the_top-level_site_on_behalf_of_embedded_resources.

[bershanskiy]

If it were me I would delete this guide page

Should I just update this PR to delete this guide page?