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

Author: jwren

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,4 +1,4 @@
-- 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.
+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.
 
 ---
 
@@ -7,8 +7,8 @@
 <details>
   <summary>Contribution guidelines:</summary><br>
 
-- See our [contributor guide]([https://github.com/dart-lang/sdk/blob/main/CONTRIBUTING.md](https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview) for general expectations for PRs.
+- 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.
 - Larger or significant changes should be discussed in an issue before creating a PR.
 - Dart contributions to our repos should follow the [Dart style guide](https://dart.dev/guides/language/effective-dart) and use `dart format`.
 - Java and Kotlin contributions should strive to follow Java and Kotlin best practices ([discussion](https://github.com/flutter/flutter-intellij/issues/8098)).
-</details>
+</details>