doc: Document UseDefaultEccGroup

src/iwd.network.rst

@@ -174,6 +174,13 @@ The group ``[Settings]`` contains general settings.
        Properly configured Access Points will typically update this setting
        appropriately via Transition Disable indications.  User customization
        of this value is thus typically not required.
+   * - UseDefaultEccGroup
+     - Values: true, false
+
+       Forces the use of the default ECC group (19) for protocols using ECC
+       (WPA3 and OWE) if set true. If unset IWD will learn the capabilities of
+       the network based on its initial association and retain that setting for
+       the duration of its process lifetime.
 
 Network Authentication Settings
 -------------------------------