chore: Fix redirected MDN URLs for HTTP headers docs

[bsmth]

Summary

The MDN HTTP reference docs have a new scheme. The following sections have a Reference/ prefix now:

• Headers
• Methods
• Statuses

So, the new scheme looks like:

- Web/HTTP/Headers/
+ Web/HTTP/Reference/Headers/

- Web/HTTP/Status/
+ Web/HTTP/Reference/Status/

- Web/HTTP/Methods/
+ Web/HTTP/Reference/Methods/

Redirects are in place on MDN for all existing URLs, but we should update the URL prefix used to avoid sending readers to 301s.

See also:

• chore(ia): Organize HTTP docs mdn/content#38555

Screenshots (optional)

N/A

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.

[bsmth]

/SameSite is not a sub-page now, so I'm linking to #samesitesamesite-value anchor. There's another occurrence below, I believe

[bsmth]

See comment above:

Suggested change

The [`SameSite` attribute of a cookie](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Set-Cookie/SameSite) specifies whether that cookie can be shared with other domains that load on the same page (ad banners, iFrames). By default, browsers do not send cookies on cross-site subrequests to prevent attackers from stealing or manipulating information present in your cookies.

The [`SameSite` attribute of a cookie](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Set-Cookie#samesitesamesite-value) specifies whether that cookie can be shared with other domains that load on the same page (ad banners, iFrames). By default, browsers do not send cookies on cross-site subrequests to prevent attackers from stealing or manipulating information present in your cookies.

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