Nit issue in the .github/PULL_REQUEST_TEMPLATE.md file, link fixed

[jwren]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @jwren, 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 minor formatting and link issues within the .github/PULL_REQUEST_TEMPLATE.md file. The changes improve the clarity and accuracy of the template by correcting a misplaced hyphen and updating a broken link to the project's contributor guidelines, making the template more user-friendly and functional.

Highlights

• PR Template Formatting: Removed an unintended list item hyphen from the initial instruction in the pull request template, improving its visual presentation.
• Contributor Guide Link Correction: Fixed a malformed and incorrect URL for the contributor guide within the PR template, ensuring it now accurately directs users to the correct Flutter contribution guidelines.

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[gemini-code-assist]

Code Review

Thanks for these fixes to the pull request template. The change to the first line is good. However, the fix for the contributor guide link is still not quite right, as the markdown syntax is malformed. I've left a suggestion to correct it.

[gemini-code-assist]

Thanks for fixing this link! However, the markdown syntax is still incorrect. It looks like you have a nested link [text]([url](url)), which isn't valid. The correct format is [text](url). I've suggested a fix to correct the syntax.

Suggested change

	- See our [contributor guide]([https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md](https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md) for general expectations for PRs.
	- See our [contributor guide](https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md) for general expectations for PRs.