Fix network low-level documentation examples

I realize that low-level documentation has outdated examples, so I
created issue #2800 to fix that

Signed-off-by: Felipe Ruhland <felipe.ruhland@gmail.com>

Author: feliperuhland

docker/api/network.py

@@ -75,7 +75,7 @@ def create_network(self, name, driver=None, options=None, ipam=None,
         Example:
             A network using the bridge driver:
 
-                >>> client.create_network("network1", driver="bridge")
+                >>> client.api.create_network("network1", driver="bridge")
 
             You can also create more advanced networks with custom IPAM
             configurations. For example, setting the subnet to
@@ -90,7 +90,7 @@ def create_network(self, name, driver=None, options=None, ipam=None,
                 >>> ipam_config = docker.types.IPAMConfig(
                     pool_configs=[ipam_pool]
                 )
-                >>> docker_client.create_network("network1", driver="bridge",
+                >>> client.api.create_network("network1", driver="bridge",
                                                  ipam=ipam_config)
         """
         if options is not None and not isinstance(options, dict):