fix: Fix broken link to SecretClass CRD docs (#697) (#699)

Author: xeniape

docs/modules/secret-operator/partials/nav.adoc

@@ -12,7 +12,7 @@
 * xref:secret-operator:security.adoc[]
 * xref:secret-operator:reference/index.adoc[]
 ** xref:secret-operator:reference/crds.adoc[]
-*** {crd-docs}/secrets.stackable.tech/secretclass/v1alpha1/[SecretClass {external-link-icon}^]
+*** {crd-docs}/secrets.stackable.tech/secretclass/v1alpha2/[SecretClass {external-link-icon}^]
 *** {crd-docs}/secrets.stackable.tech/truststore/v1alpha1/[TrustStore {external-link-icon}^]
 ** xref:secret-operator:reference/commandline-parameters.adoc[]
 * xref:secret-operator:troubleshooting.adoc[]