docs(stackable-versioned): Improve CRD shortname argument description

Author: NickLarsenNZ

crates/stackable-versioned-macros/src/attrs/k8s.rs

@@ -16,7 +16,7 @@ use syn::Path;
 /// - `namespaced`, to specify that this is a namespaced resource rather than cluster level.
 /// - `crates`: Override specific crates.
 /// - `status`: Sets the specified struct as the status subresource.
-/// - `shortname`: Sets one or more shortnames for the CRD.
+/// - `shortname`: Sets a shortname for the CRD. This can be specified multiple times.
 /// - `skip`, which controls skipping parts of the generation.
 #[derive(Clone, Debug, FromMeta)]
 pub(crate) struct KubernetesArguments {

crates/stackable-versioned-macros/src/lib.rs

@@ -612,7 +612,8 @@ Currently, the following arguments are supported:
   a cluster scoped.
 - `crates`: Override specific crates.
 - `status`: Sets the specified struct as the status subresource.
-- `shortname`: Sets the shortname of the CRD.
+- `shortname`: Sets a shortname for the CRD. This can be specified multiple
+  times.
 
 ### Versioning Items in a Module