Understanding: All guidelines are named as SC

[JAWS-test]

Example: https://www.w3.org/WAI/WCAG21/Understanding/time-based-media:

Understanding SC 1.2: Time-based Media. Success Criterion (SC): Provide alternatives for time-based media.

Also, there are Empty page contents in these Understanding docs. Example: https://www.w3.org/WAI/WCAG21/Understanding/documenting-accessibility-support

Empty page contents should either be removed or (better) the page should have section headings (see WCAG SC 2.4.10)

[alastc]

Took me a moment to understand, but the point being that these are understanding docs for the guideline, not a success criterion.

I think that'll be due to the redesign, so I'll tag it as such.

[kfranqueiro]

This is resolved now that WCAG 2.1 informative docs have been republished via the new build system, made possible via #4007.