[rfw] Remove old TODOs for code block languages. (#11080)

Fixing flutter/flutter#157620. No actual changes, just cleaning up a couple of comments.
I avoided running the formatter because it changes the entire file, but if you'd like me to, I can.
I also didn't add any tests, nor pubspec, CHANGELOG changes.

## Pre-Review Checklist

**Note**: The Flutter team is currently trialing the use of [Gemini Code Assist for GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code). Comments from the `gemini-code-assist` bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed.

[^1]: Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling.

Author: kallentu

packages/rfw/lib/src/flutter/material_widgets.dart

@@ -64,16 +64,10 @@ import 'runtime.dart';
 ///    be supported. As a result, the following `ButtonBar` parameters are no longer
 ///    supported:
 ///
-// TODO(kallentu): Remove ignore and fix when stable is bumped.
-// https://github.com/flutter/flutter/issues/157620
-// ignore: missing_code_block_language_in_doc_comment
 ///    * `buttonMinWidth`
 ///    * `buttonHeight`
 ///    * `buttonAlignedDropdown`
 ///
-// TODO(kallentu): Remove ignore and fix when stable is bumped.
-// https://github.com/flutter/flutter/issues/157620
-// ignore: missing_code_block_language_in_doc_comment
 ///    It is recommended to use the [OverflowBar] widget.
 ///
 /// Some features are not supported: