doc: Describe Set properties of fi.w1.wpa_supplicant1.Network

The current description of Properties of fi.wq.wpa_supplicant1.Network
only apply when retrieving these.
If you need to use the method=Set, then the types should be in the same
format as with function AddNetwork().

Signed-off-by: Clemens Famulla-Conrad <cfamullaconrad@suse.de>

doc/dbus.doxygen

@@ -2107,7 +2107,7 @@ i.e., returned by fi.w1.wpa_supplicant1.Interface.AddNetwork.
 
       <li>
 	<h3>Properties - a{sv} - (read/write)</h3>
-	<p>Properties of the configured network. Dictionary contains entries from "network" block of wpa_supplicant configuration file. All values are string type, e.g., frequency is "2437", not 2437.
+	<p>Properties of the configured network. Dictionary contains entries from "network" block of wpa_supplicant configuration file. All values are string type, e.g., frequency is "2437", not 2437. When setting the properties, use the same format as for the AddNetwork() function.</p>
       </li>
     </ul>