[Chore] More fixes to MDN redirected URLs (#21515)

Author: RebeccaTamachiro

src/content/docs/waiting-room/additional-options/embed-waiting-room-in-iframe.mdx

@@ -12,7 +12,7 @@ Because of how a waiting room [tracks visitor progress](#background), you need t
 
 ## Background
 
-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.
 
 However, this behavior can prevent a waiting room from queueing a user properly if that waiting room is embedded in an iFrame. The waiting room depends on the [`__cfwaitingroom` cookie](/waiting-room/reference/waiting-room-cookie/) to track a user in the queue. But, since the browser blocks the cookie from reaching the waiting room by default, an active and queueing waiting room cannot queue the user and will never let them access the application.
 

src/content/partials/workers/custom_headers.mdx

@@ -142,7 +142,7 @@ You can prevent click-jacking by informing browsers not to embed your applicatio
 
 [`Referrer-Policy`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Referrer-Policy) allows you to customize how much information visitors give about where they are coming from when they navigate away from your page.
 
-Browser features can be disabled to varying degrees with the [`Permissions-Policy`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Feature-Policy) header (recently renamed from `Feature-Policy`).
+Browser features can be disabled to varying degrees with the [`Permissions-Policy`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy) header (recently renamed from `Feature-Policy`).
 
 If you need fine-grained control over your application's content, the [`Content-Security-Policy`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy) header allows you to configure a number of security settings, including similar controls to the `X-Frame-Options` header.