docs: add missing closing fence in AsyncValue.guard

[lishaduck]

This broke gh syntax highlighting for the file.

Related Issues

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Checklist

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• I have updated the CHANGELOG.md of the relevant packages.
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  ## Unreleased fix/major/minor
  
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Summary by CodeRabbit

• Documentation
  • Enhanced documentation for the AsyncValue<T> class with an illustrative code block example for error handling.

^^^ It hallucinated 😉

[coderabbitai]

Walkthrough

The pull request introduces a documentation enhancement to the AsyncValue<T> abstract class in the Riverpod package. It adds a code block comment that provides an example of using an optional callback for error handling. This change aims to clarify the documentation for developers, improving their understanding of how to manage exceptions without altering the existing functionality of the code.

Changes

Files	Change Summary
packages/riverpod/lib/src/common.dart	Added documentation code block example in AsyncValue<T> class

Poem

In the code where rivers flow,
A rabbit hops, with knowledge to show.
A snippet here, a comment there,
Helping all who seek to care.
With each line, the wisdom grows,
In Riverpod, the clarity glows! 🐇✨

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Commits

Files that changed from the base of the PR and between 1c43ed7 and 652c30c.

Files selected for processing (1)

• packages/riverpod/lib/src/common.dart (1 hunks)

Files skipped from review due to trivial changes (1)

• packages/riverpod/lib/src/common.dart

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[lishaduck]

Does this need a changelog entry? I can make one, but it's really to be categorized as a "fix" (or minor or breaking).

[rrousselGit]

Thanks!