Fix Broken Links In Documentation (#28321)

## Summary

I used [link-inspector](https://github.com/justindhillon/link-inspector)
to find a bunch of broken links in this projects documentation. Here is
what I fixed:

https://www.html5rocks.com/en/tutorials/canvas/hidpi/ -->
https://web.dev/articles/canvas-hidipi


https://w3c.github.io/webcomponents/spec/custom/#custom-elements-core-concepts
--> https://www.w3.org/TR/custom-elements/


https://github.com/facebookarchive/fixed-data-table/blob/main/src/vendor_upstream/dom/normalizeWheel.js
-->
https://github.com/facebookarchive/fixed-data-table/blob/master/src/vendor_upstream/dom/normalizeWheel.js

https://upload.wikimedia.org/wikipedia/commons/e/ee/Atom_%282%29.png -->
https://upload.wikimedia.org/wikipedia/commons/1/1b/Atom.png

## Support my work

I used [link-inspector](https://github.com/justindhillon/link-inspector)
to find and fix this issue. If you find this PR useful, give the repo a
⭐

packages/react-devtools-shared/src/devtools/cache.js

@@ -15,7 +15,7 @@ import {createContext} from 'react';
 // TODO (cache) Remove this cache; it is outdated and will not work with newer APIs like startTransition.
 
 // Cache implementation was forked from the React repo:
-// https://github.com/facebook/react/blob/main/packages/react-cache/src/ReactCache.js
+// https://github.com/facebook/react/blob/main/packages/react-cache/src/ReactCacheOld.js
 //
 // This cache is simpler than react-cache in that:
 // 1. Individual items don't need to be invalidated.