Fix MAC address option typo in how-to documentation (apple#980)

- Corrects the MAC address example command in the
  how-to guide to use the correct `--network` flag syntax
  instead of the incorrect `--mac-address` flag.

Author: claudeaceae

docs/how-to.md

@@ -216,7 +216,7 @@ container run --network default,mac=02:42:ac:11:00:02 ubuntu:latest
 To verify the MAC address is set correctly, run `ip addr show` inside the container:
 
 ```console
-% container run --rm --mac-address 02:42:ac:11:00:02 ubuntu:latest ip addr show eth0
+% container run --rm --network default,mac=02:42:ac:11:00:02 ubuntu:latest ip addr show eth0
 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
     link/ether 02:42:ac:11:00:02 brd ff:ff:ff:ff:ff:ff
     inet 192.168.64.2/24 brd 192.168.64.255 scope global eth0