docs: fix wrong command syntax in code annotation (#3081)

Signed-off-by: Maxim Mironyuk <serieznyi@gmail.com>

docker/models/networks.py

@@ -184,7 +184,7 @@ def get(self, network_id, *args, **kwargs):
 
     def list(self, *args, **kwargs):
         """
-        List networks. Similar to the ``docker networks ls`` command.
+        List networks. Similar to the ``docker network ls`` command.
 
         Args:
             names (:py:class:`list`): List of names to filter by.