Update w3 reference in the react-a11y-role rule

[arthurdenner]

Currently, the react-a11y-role rule points to an old URL that doesn't exist anymore.

I never saw the previous URL, but I believe the content was the same contained in this URL.

However, we also have this new URL that seems to contain a more complete explanation about each one of the possible role values.

Should we update the URL in the react-a11y-role rule? If so, to which URL?

I'd be glad to open a PR with this change, if possible.

[JoshuaKGoldberg]

Good catch! Let's go with the apparent new URL, https://www.w3.org/TR/wai-aria-1.1/#role_definitions.