Docs - use draft PR over WIP (#9504)

docs: use draft pr over wip

.github/CONTRIBUTING.md

@@ -36,7 +36,7 @@ We welcome anyone to contribute to this repository. Issues that we are actively
 
 When contributing to this repository, please first discuss the change you wish to make via issue or [Discord](https://acemod.org/discord) with the [ACE3 project maintainers](https://ace3.acemod.org/team.html) before making a change. This may not be necessary if you are contributing for something which has an existing issue in our repository already.
 
-1. Please make a pull request (PR) as early as possible. This lets use help you in the proces of developing it. When opening a work in progress pull request, mark your PR with a `WIP:` prefix.
+1. Please make a pull request (PR) as early as possible. This lets use help you in the proces of developing it. When opening a work in progress pull request, use GitHub's draft feature. This will mark the PR as a work in progress and will prevent it from being merged until you mark it as ready for review.
 2. Describe what this pull request will do and how it solves this in the description of your PR. A clear intent and description of the way the issue is resolved will help us to review the PR more efficiently.
 3. Please follow our [Development Guidelines](https://ace3.acemod.org/wiki/development/).