add missing basic-project-doc link

Author: semihbkgr

docs/book/src/migration/v3vsv4.md

@@ -67,8 +67,9 @@ This way is more complex, susceptible to errors, and success cannot be assured.
 [go/v4-doc]: ./../plugins/go-v4-plugin.md
 [migration-guide-gov3-to-gov4]: migration_guide_gov3_to_gov4.md
 [manually-upgrade]: manually_migration_guide_gov3_to_gov4.md
+[basic-project-doc] ./../cronjob-tutorial/basic-project.md
 [standard-go-project]: https://github.com/golang-standards/project-layout
 [controller-runtime]: https://github.com/kubernetes-sigs/controller-runtime
 [controller-tools]: https://github.com/kubernetes-sigs/controller-tools
 [kustomize-release]: https://github.com/kubernetes-sigs/kustomize/releases/tag/kustomize%2Fv5.0.0
-[kb-releases]: https://github.com/kubernetes-sigs/kubebuilder/releases
+[kb-releases]: https://github.com/kubernetes-sigs/kubebuilder/releases