docs/library/network: Fix ref to "socket" module (should be "usocket").

docs/library/network.rst

@@ -9,7 +9,7 @@ This module provides network drivers and routing configuration. To use this
 module, a MicroPython variant/build with network capabilities must be installed.
 Network drivers for specific hardware are available within this module and are
 used to configure hardware network interface(s). Network services provided
-by configured interfaces are then available for use via the :mod:`socket`
+by configured interfaces are then available for use via the :mod:`usocket`
 module.
 
 For example::