[CI-SKIP] Fix typo in CONTRIBUTING.md

CONTRIBUTING.md

@@ -1,7 +1,7 @@
 Contributing to Paper
 ==========================
 PaperMC is happy you're willing to contribute to our projects. We are usually
-very lentient with all submitted PRs, but there are still some guidelines you
+very lenient with all submitted PRs, but there are still some guidelines you
 can follow to make the approval process go more smoothly.
 
 **Table of contents:**