fix(docs): correct MDN URL for decoding attribute of next/image compo…

…nent (#71029)

This PR fixes the MDN URL reference for the `decoding` attribute, which
had the incorrect URL from the `loading` attribute of the `<Image>`
component in the API Reference section of docs.

Co-authored-by: JJ Kasper <jj@jjsweb.site>

docs/02-app/02-api-reference/01-components/image.mdx

@@ -477,7 +477,7 @@ Possible values are the following:
 - `sync` - Synchronously decode the image for atomic presentation with other content.
 - `auto` - No preference for the decoding mode; the browser decides what's best.
 
-Learn more about the [`decoding` attribute](https://developer.mozilla.org/docs/Web/HTML/Element/img#loading).
+Learn more about the [`decoding` attribute](https://developer.mozilla.org/docs/Web/HTML/Element/img#decoding).
 
 ### Other Props