Outdated links in 5.5 (Fetch: Cross-Origin Requests)

There are some links to http://www.w3.org/TR/cors/ which are redirected to https://fetch.spec.whatwg.org/ now.

http://www.w3.org/TR/cors/#terminology (2 links) seems to have an outdated fragment part.

The fragment parts of http://www.w3.org/TR/cors/#simple-method and http://www.w3.org/TR/cors/#simple-header may need checking if they are valid now.
