Replace straggler WAI/WCAG21 links to WAI/WCAG22

[patrickhlauke]

Closes #3635

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[patrickhlauke]

Ah, this PR currently fails the "Reflect status" check, but no idea what that is (and the error it shows in the log is not very helpful in that regard). is this the check that wants to avoid a mix of normative and non-normative files being changed in the same PR? and if so, should i bifurcate this PR into two separate ones? (and also, can the error messaging in the check https://github.com/w3c/wcag/actions/runs/17083042062/job/48441437816?pr=4564#step:9:7 be made a bit more human-understandable?)

[mbgower]

@kfranqueiro is Patrick's analysis correct? Is this just flagging him on a mixed normative/non-normative PR?

[kfranqueiro]

If you scroll to the top of the check and expand the Annotations section (or click Summary and scroll down which shows the same annotations), you will see the human-readable version:

Check for isolation of changes to TR space or informative docs
Please submit changes to TR space separately from changes to informative docs.

This isn't reflected as clearly within the log in order to allow running all of the checks at once rather than short-circuiting as soon as one fails. IIRC I also tried separating each to its own job but that proved less readable for other reasons.

[patrickhlauke]

do we want/need to separate this PR into two then?

[patrickhlauke]

Assuming so, done #4586