Fix CRD/CR typo in migration guide (#2141)

Author: Slayv

doc/migration/version-upgrade-guide.md

@@ -481,7 +481,7 @@ All method signatures for [`sigs.k8s.io/controller-runtime/pkg/client.Client`](h
 - The annotation to assign a scope to your CRD has changed. For the following changes, note that `<resource>` is the plural lower-case CRD Kind found at `spec.names.plural`.
     - For `Namespaced`-scoped operators, add a `+kubebuilder:resource:path=<resource>,scope=Namespaced` comment above your kind type in `pkg/apis/<group>/<version>/<kind>_types.go`.
     - For `Cluster`-scoped operators, replace the `+genclient:nonNamespaced` comment above your kind type in `pkg/apis/<group>/<version>/<kind>_types.go` with `+kubebuilder:resource:path=<resource>,scope=Cluster`.
-- CRD file names now have the form `<full group>_<resource>_crd.yaml`, and CRD file names now have the form `<full group>_<version>_<kind>_cr.yaml`. `<full group>` is the full group name of your CRD found at `spec.group`, and `<resource>` is the plural lower-case CRD Kind found at `spec.names.plural`. To migrate:
+- CRD file names now have the form `<full group>_<resource>_crd.yaml`, and CR file names now have the form `<full group>_<version>_<kind>_cr.yaml`. `<full group>` is the full group name of your CRD found at `spec.group`, and `<resource>` is the plural lower-case CRD Kind found at `spec.names.plural`. To migrate:
     - Run `operator-sdk generate openapi`. CRD manifest files with new names containing versioned validation and subresource blocks will be generated.
     - Delete the old CRD manifest files.
     - Rename CR manifest file names from `<group>_<version>_<kind>_cr.yaml` to `<full group>_<version>_<kind>_cr.yaml`.