Update prefer_interpolation_to_compose_strings.md

[jmun304]

Explain advantages of string interpolation in prefer_interpolation_to_compose_strings

Thanks for your contribution! Please replace this text with a description of what this PR is changing or adding and why, list any relevant issues, and review the contribution guidelines below.

Fixes #7001

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[gemini-code-assist]

Summary of Changes

Hello @jmun304, 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 improves the clarity and completeness of the documentation for a Dart diagnostic by providing a more detailed explanation of why string interpolation is preferred. The changes aim to educate developers on the practical benefits and potential pitfalls associated with different string composition methods.

Highlights

• Enhanced Documentation for String Interpolation: The documentation for the prefer_interpolation_to_compose_strings diagnostic has been updated to clearly explain the advantages of using string interpolation over string concatenation with the + operator.
• Benefits of String Interpolation: Added specific points highlighting that string interpolation improves readability, reduces the chance of errors when combining values, and is easier to maintain.
• Warning on Concatenation: A note was added to emphasize that using multiple + operators for string concatenation can be more error-prone, especially when dealing with several values.

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[gemini-code-assist]

Code Review

This pull request updates the documentation for the prefer_interpolation_to_compose_strings diagnostic to explain the benefits of using string interpolation. The changes are helpful and clarify the reasoning behind the lint. I have a couple of minor suggestions to improve the wording and ensure it aligns with the Google Developer Documentation Style Guidelines, focusing on grammar and tone.

[antfitch]

LGTM, but let's have @parlough take one last look.

[parlough]

Thanks for working on this. However, the source of truth for this doc is in a different repository, in https://github.com/dart-lang/sdk/blob/e4fd90fc45a379570e965585e7f98b639264b616/pkg/linter/messages.yaml#L10212-L10247.

If you're still interested in making this change, could you open a PR against that file?

I'll follow up this PR to update this file with a comment that clarifies where it should be updated. Sorry about the misdirection and thanks again!