Update external links 07-edge.mdx (#65728)

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Co-authored-by: Sam Ko <sam@vercel.com>

Author: mirasayon

docs/02-app/02-api-reference/07-edge.mdx

@@ -26,8 +26,8 @@ The Next.js Edge Runtime is used for Middleware and supports the following APIs:
 
 | API                                                                                 | Description                        |
 | ----------------------------------------------------------------------------------- | ---------------------------------- |
-| [`atob`](https://developer.mozilla.org/docs/Web/API/WindowOrWorkerGlobalScope/atob) | Decodes a base-64 encoded string   |
-| [`btoa`](https://developer.mozilla.org/docs/Web/API/WindowOrWorkerGlobalScope/btoa) | Encodes a string in base-64        |
+| [`atob`](https://developer.mozilla.org/en-US/docs/Web/API/atob)                     | Decodes a base-64 encoded string   |
+| [`btoa`](https://developer.mozilla.org/en-US/docs/Web/API/btoa)                     | Encodes a string in base-64        |
 | [`TextDecoder`](https://developer.mozilla.org/docs/Web/API/TextDecoder)             | Decodes a Uint8Array into a string |
 | [`TextDecoderStream`](https://developer.mozilla.org/docs/Web/API/TextDecoderStream) | Chainable decoder for streams      |
 | [`TextEncoder`](https://developer.mozilla.org/docs/Web/API/TextEncoder)             | Encodes a string into a Uint8Array |