Merge pull request kubernetes-sigs#2251 from soumitraj/patch-1

📖 Update Typo in README.md

Author: k8s-ci-robot

README.md

@@ -63,7 +63,7 @@ Building APIs using CRDs, Controllers and Admission Webhooks.
 
 ## Philosophy
 
-See [DESIGN.md](DESIGN.md) for the guiding principals of the various KubeBuilder projects.
+See [DESIGN.md](DESIGN.md) for the guiding principles of the various KubeBuilder projects.
 
 TL;DR: