docs - dead Link in cdk accessibility

[Maccodonaldo]

What is the expected behavior?

the link should reroute to the W3C page [https://www.w3.org/TR/wai-aria/states_and_properties#aria-live]

What is the current behavior?

The page does not exist anyore

What are the steps to reproduce?

Just go on the page [(https://material.angular.io/cdk/a11y/overview)]

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