Fix Contributor Guide link in Pull Request Template

Author: YC

.github/pull_request_template.md

@@ -4,7 +4,7 @@
 
 <!-- If this is your first PR in the ASP.NET API Versioning repo, please run through the checklist below to ensure a smooth review and merge process for your PR. -->
 
-- [ ] You've read the [Contributor Guide](https://github.com/dotnet/aspnet-api-versioning/blob/main/CONTRIBUTING.md) and [Code of Conduct](https://dotnetfoundation.org/code-of-conduct).
+- [ ] You've read the [Contributor Guide](https://github.com/dotnet/aspnet-api-versioning/blob/main/docs/CONTRIBUTING.md) and [Code of Conduct](https://dotnetfoundation.org/code-of-conduct).
 - [ ] You've included unit or integration tests for your change, where applicable.
 - [ ] You've included inline docs for your change, where applicable.
 - [ ] There's an open issue for the PR that you are making. If you'd like to propose a new feature or change, please open an issue to discuss the change or find an existing issue.