docs: explain registries

Author: xhyrom

action.yml

@@ -23,7 +23,7 @@ inputs:
     description: "The scope for authenticating with the package registry."
   registries:
     required: false
-    description: "An object of package registries mapped by scope for authenticating with the package registry."
+    description: "An list of package registries for authenticating with the package registry."
   no-cache:
     required: false
     type: boolean