[data-shapes] errors in `shacl12-core/index.html` (#272)

TallTed has just created a new issue for https://github.com/w3c/data-shapes:

== errors in `shacl12-core/index.html`  ==
_Originally posted by @YoucTagh in https://github.com/w3c/data-shapes/issues/258#issuecomment-2677872403_

> In `shacl12-core/index.html` I can add:
> - On line 503 there is a stray end tag `a`.
> - On line 1279, `aside` was open but never closed. The same on line 2602.

Please view or discuss this issue at https://github.com/w3c/data-shapes/issues/272 using your GitHub account


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