Update impeller.md for web (#11768)

_Description of what this PR is changing or adding, and why:_

_Issues fixed by this PR (if any):_

_PRs or commits this PR depends on (if any):_

## Presubmit checklist

- [ ] This PR is marked as draft with an explanation if not meant to
land until a future stable release.
- [x] This PR doesn’t contain automatically generated corrections
(Grammarly or similar).
- [x] This PR follows the [Google Developer Documentation Style
Guidelines](https://developers.google.com/style) — for example, it
doesn’t use _i.e._ or _e.g._, and it avoids _I_ and _we_ (first person).
- [x] This PR uses [semantic line
breaks](https://github.com/dart-lang/site-shared/blob/main/doc/writing-for-dart-and-flutter-websites.md#semantic-line-breaks)
of 80 characters or fewer.

---------

Co-authored-by: Shams Zakhour (ignore Sfshaza) <[email protected]>

Author: mit-mit

src/content/perf/impeller.md

@@ -98,12 +98,11 @@ No action on your part is necessary for this fallback behavior.
 
 ### Web
 
-Flutter on the web offers two renderers and
-two build modes. For more information, visit
-[Flutter web support][] in the Flutter
-architectural guide.
+Flutter on the web offers [two renderers][] --
+`canvaskit` and `skwasm` -- which both currently use Skia.
+They might use Impeller in the future.
 
-[Flutter web support]: /resources/architectural-overview#flutter-web-support
+[two renderers]: /platform-integration/web/renderers#renderers
 
 ### macOS