Fix link for CRD-version-pref

This commit fix link for CRD-version-pref.

Author: atoato88

docs/book/src/multiversion-tutorial/deployment.md

@@ -119,3 +119,5 @@ resource.version.group` is for everything else.
 [steps for troubleshooting](/TODO.md)
 
 [ref-multiver]: /reference/generating-crd.md#multiple-versions "Generating CRDs: Multiple Versions"
+
+[crd-version-pref]: https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definition-versioning/#version-priority "Versions in CustomResourceDefinitions"