docs: making default datastore optional

Signed-off-by: Dario Tranchitella <[email protected]>

docs/content/reference/api.md

@@ -837,8 +837,10 @@ such as the number of Pod replicas, the Service resource, or the Ingress.<br/>
         <td><b>dataStore</b></td>
         <td>string</td>
         <td>
-          DataStore allows to specify a DataStore that should be used to store the Kubernetes data for the given Tenant Control Plane.
-This parameter is optional and acts as an override over the default one which is used by the Kamaji Operator.
+          DataStore specifies the DataStore that should be used to store the Kubernetes data for the given Tenant Control Plane.
+When Kamaji runs with the default DataStore flag, all empty values will inherit the default value.
+By leaving it empty and running Kamaji with no default DataStore flag, it is possible to achieve automatic assignment to a specific DataStore object.
+
 Migration from one DataStore to another backed by the same Driver is possible. See: https://kamaji.clastix.io/guides/datastore-migration/
 Migration from one DataStore to another backed by a different Driver is not supported.<br/>
         </td>