changed some formulation

Author: fhennig

modules/concepts/pages/resources.adoc

@@ -104,7 +104,8 @@ IMPORTANT: Stackable operators use different names (`data` in this example) for
 
 A StorageClass defines a type of storage with certain properties.
 The StorageClasses that are available on a Kubernetes cluster are configured by the cluster administrator.
-Different classes can be configured to provide different levels of reliability or speed, or be configured to be more suited for read or write heavy loads, based on the underlying storage technology (SSD, HDD, NAS) or by adjusing Kubernetes settings for different classes (find more information in the https://kubernetes.io/docs/concepts/storage/storage-classes/[Kubernetes documentation]).
+Different classes can be configured to provide different levels of reliability or speed, or be configured to be more suited for read or write heavy loads.
+This configuration is either done in the storage backend or Kubernetes settings (find more information in the https://kubernetes.io/docs/concepts/storage/storage-classes/[Kubernetes documentation]).
 
 For Stackable resources, setting a StorageClass is not mandatory; if not StorageClass is set, the https://kubernetes.io/docs/concepts/storage/storage-classes/#default-storageclass[default StorageClass] will be used. If you want to use a specific StorageClass for a particular storage, the StorageClass can be set on the resource: