network_settings.py: fix documentation
network_settings.py: fix documentation

Module documentation is showing an incorrect config example since it's
omitting the network_settings identifier.

Signed-off-by: Alejandro del Castillo <c09cbcd73cd5840fe009d82a3ad13af11b4d7b46@ni.com>

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt