doc(card): fix landmark roles link

[heavybeard]

No description provided.

[josephperrott]

LGTM

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[heavybeard]

@josephperrott I verified the 3 links 20 minutes ago and they go to a 404 page, if you want I found these links that can replace those present

https://www.w3.org/WAI/GL/wiki/Using_grouping_roles_to_identify_related_form_controls
https://www.w3.org/TR/wai-aria-practices/examples/landmarks/region.html
https://www.w3.org/TR/wai-aria-practices/examples/landmarks/index.html

[josephperrott]

I am not sure where they should go with w3 updating the site. @jelbourn @mmalerba @crisbeto thoughts?

[mmalerba]

https://www.w3.org/TR/wai-aria/#group
https://www.w3.org/TR/wai-aria/#region
https://www.w3.org/TR/wai-aria/#landmark

[heavybeard]

@josephperrott , I have updated the links with the new ones posted by @mmalerba (they seem perfect for documentation)

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