Update user guides on unsupported operations by the various device registries

Signed-off-by: Kartheeswaran Kalidass <[email protected]>

Author: kaniyan

site/documentation/content/user-guide/file-based-device-registry.md

@@ -20,6 +20,10 @@ The resources have been designed to provide convenient access to the registry's
 
 Please refer to the [Device Registry Management API]({{< relref "/api/management#tenants" >}}) for information about managing tenants.
 
+{{% warning %}}
+The file based device registry doesn't support [search tenants]({{< relref "/api/management#tenants/searchTenants" >}}) operation defined by the Device Registry Management API.
+{{% /warning %}}
+
 ## Managing Devices
 
 Please refer to the [Device Registry Management API]({{< relref "/api/management#devices" >}}) for information about managing devices.

site/documentation/content/user-guide/jdbc-based-device-registry.md

@@ -11,10 +11,18 @@ In addition to the above APIs, this Device Registry also exposes HTTP endpoints
 
 Please refer to the [Device Registry Management API]({{< relref "/api/management#tenants" >}}) for information about managing tenants.
 
+{{% warning %}}
+The JDBC based device registry doesn't support [search tenants]({{< relref "/api/management#tenants/searchTenants" >}}) operation defined by the Device Registry Management API.
+{{% /warning %}}
+
 ## Managing Devices
 
 Please refer to the [Device Registry Management API]({{< relref "/api/management#devices" >}}) for information about managing devices.
 
+{{% warning %}}
+The JDBC based device registry doesn't support [search devices]({{< relref "/api/management#devices/searchDevicesForTenant" >}}) operation defined by the Device Registry Management API.
+{{% /warning %}}
+
 ## Managing Credentials
 
 Please refer to the [Device Registry Management API]({{< relref "/api/management#credentials" >}}) for information about managing credentials.