Fix typo

Author: bgrant0607

site/book/02-concepts/00.md

@@ -39,6 +39,6 @@ The kpt toolchain includes the following components:
   leverages [Kustomize](https://kustomize.io) to automatically render manifests on the fly when needed. It uses the same apply
   logic as the kpt CLI.
 
-- **Backage UI plugin**: We've created a proof-of-concept UI to demonstrate the WYSIWYG experience that's possible on top of the
+- **Backstage UI plugin**: We've created a proof-of-concept UI to demonstrate the WYSIWYG experience that's possible on top of the
   package orchestrator. More scenarios can be supported by implementing form-based editors for additional Kubernetes resource types.