Iterate on crossorigin language in Link preload header comments

[MadLittleMods]

Follow-up to #185

Iterate on crossorigin language in Link preload header comments.

I'm still not totally sure but here are my references 🤔

• https://html.spec.whatwg.org/multipage/urls-and-fetching.html#cors-settings-attribute
• https://html.spec.whatwg.org/multipage/links.html#link-type-preload
• https://developer.chrome.com/blog/modulepreload/#ok-so-why-doesnt-link-relpreload-work-for-modules

The link header contains parameters, which are separated with ; and are equivalent to attributes of the <link> element.

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Link#parameters