Fix broken link

[MoritzMessner]

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

Changes
Changed link to show actual file at location https://github.com/flutter/website/blob/main/examples/resources/dart_swift_concurrency/lib/async_weather.dart

Why
Page https://docs.flutter.dev/get-started/flutter-for/dart-swift-concurrency#:~:text=For%20the%20complete%20example%2C%20check%20out%20the%20async_weather%20file%20on%20GitHub
Currently Link points to https://github.com/flutter/website/examples/resources/dart_swift_concurrency/lib/async_weather.dart
and results in a Not Found message.

Issues fixed by this PR (if any):

PRs or commits this PR depends on (if any):

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[gemini-code-assist]

Summary of Changes

Hello @MoritzMessner, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical issue in the Flutter documentation by fixing a broken link. The original link, intended to guide users to an example Dart file on GitHub, was malformed and resulted in a 'Not Found' error. By adjusting the URL path to properly reference the file within the repository structure, this change ensures that users can seamlessly access the associated code example, improving the overall user experience and accuracy of the documentation.

Highlights

• Broken Link Fix: Corrected a broken link within the dart-swift-concurrency.md documentation file that was leading to a 'Not Found' page on GitHub.
• URL Path Correction: The fix involved adding the /blob/main/ segment to the GitHub URL, ensuring it correctly points to the async_weather.dart example file.

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[gemini-code-assist]

Code Review

This pull request successfully fixes a broken link in the 'Flutter concurrency for Swift developers' documentation. The original link to the async_weather.dart example file was resulting in a 404 error. The change correctly updates the URL to point to the file's location on the main branch, resolving the issue. The fix is correct and well-contained.