Fix unclosed parentheses error on "Create a widget to make buttons" code excerpt

[autorejecttop]

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

1. Stumbled on an unclosed parentheses error while doing the tutorial
2. Added the closing parenthesis
3. No more stumbling :D

Issues fixed by this PR (if any):

• Presumed none

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

• Presumed none

Presubmit checklist

• If you are unwilling, or unable, to sign the CLA, even for a tiny, one-word PR, please file an issue instead of a PR.
• If this PR is not meant to land until a future stable release, mark it as draft with an explanation.
• This PR follows the Google Developer Documentation Style Guidelines—for example, it doesn't use i.e. or e.g., and it avoids I and we (first-person pronouns).
• This PR uses semantic line breaks
  of 80 characters or fewer.

[gemini-code-assist]

Summary of Changes

Hello @autorejecttop, 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 minor but crucial syntax error in a code snippet within the src/content/ui/layout/tutorial.md file. The change involves adding a missing closing curly brace to a StatelessWidget definition, which was causing an unclosed parentheses error. This fix ensures the tutorial's code examples are accurate and functional, improving the user experience for those following the guide.

Highlights

• Syntax Correction: This pull request fixes an unclosed curly brace in a code excerpt within the src/content/ui/layout/tutorial.md file, specifically for the ButtonWithText StatelessWidget.
• Tutorial Accuracy: The change ensures that the code example provided in the tutorial is syntactically correct and runnable, preventing errors for users following the guide.

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[gemini-code-assist]

Code Review

This pull request correctly fixes a missing closing brace in a Dart code snippet within the layout tutorial, which was causing a syntax error. While this change effectively resolves the issue for readers of the documentation, it's worth noting that the code snippet appears to be generated from a source file (examples/layout/lakes/step3/lib/main.dart). The underlying problem is likely a misplaced docregion tag in that source file. Modifying the markdown file directly might lead to the fix being overwritten if the documentation is regenerated. For a more permanent solution, the docregion in the source file should be corrected. However, as this PR targets the documentation file, the fix is valid for the problem it solves.

[parlough]

/gcbrun

[flutter-website-bot]

Visit the preview URL for this PR (updated for commit 1027377):

https://flutter-docs-prod--pr12877-patch-7-90hezyl7.web.app

[parlough]

Thanks for noticing and fixing this! I appreciate it :D