document increasing filebased storage

Author: maltesander

docs/modules/nifi/pages/usage_guide/resource-configuration.adoc

@@ -3,7 +3,8 @@
 
 == Volume storage
 
-By default, a NiFi Stacklet creates five different persistent volume claims for flow files, provenance, database, content and state directories.
+By default, a NiFi Stacklet creates five different persistent volume claims for flow files, provenance, database, content and state directories. 
+Depending on the NiFi cluster definition, another PVC for file-based authorization is added.
 You can find the default sizes of the PVCs in the {crd-docs}/nifi.stackable.tech/NifiCluster/v1alpha1/#spec-nodes-config-resources-storage[NifiCluster reference docs {external-link-icon}^], it is recommended that you configure these volume requests according to your needs.
 
 Storage requests can be configured at role or group level, for one or more of the persistent volumes as follows:
@@ -16,6 +17,8 @@ nodes:
       config:
         resources:
           storage:
+            filebasedRepo:
+              capacity: 12Gi
             flowfileRepo:
               capacity: 12Gi
             provenanceRepo:

docs/modules/nifi/pages/usage_guide/security.adoc

@@ -211,7 +211,24 @@ spec:
             initialAdminUser: "cn=admin,ou=users,dc=example,dc=org"
 ----
 
-This configuration provides an additional PVC to NiFi pods in order to read and persist the `users.xml` and `authorizations.xml`.
+This configuration provides an additional PVC to NiFi pods in order to read and persist the `users.xml` and `authorizations.xml` files.
+The default size is 16Mi and can be increased via the storage configuration on role or rolegroup level:
+
+[source,yaml]
+----
+apiVersion: nifi.stackable.tech/v1alpha1
+kind: NifiCluster
+metadata:
+  name: test-nifi
+spec:
+  clusterConfig: { .. }
+  nodes: 
+    config:
+      resources:
+        storage:
+          filebasedRepo:
+            capacity: 256Mi
+----
 
 [#authorization-opa]
 === Open Policy Agent (OPA)