Update vlan-networks.md
Update vlan-networks.md

Some small changes to get the examples so that they run without error for me.
Improve consistency of presentation of the examples.
Fix some typos

Signed-off-by: kevinfeyrer <13b3a1c3eb41617e7ef200b806daa262666847aa@btinternet.com>

Update vlan-networks.md

Restore "ip" accidentally removed

Signed-off-by: kevinfeyrer <13b3a1c3eb41617e7ef200b806daa262666847aa@btinternet.com>

Update vlan-networks.md

Change prompt from container "$$" to host "$"

Signed-off-by: kevinfeyrer <13b3a1c3eb41617e7ef200b806daa262666847aa@btinternet.com>

Update vlan-networks.md

Some changes suggested by cpuguy83 and thaJeztah

Signed-off-by: kevinfeyrer <13b3a1c3eb41617e7ef200b806daa262666847aa@btinternet.com>

thaJeztah/cli,dnephin/cli,redpanda/cli,allencloud/cli,redpanda/cli,dnephin/cli,e11137/cli,allencloud/cli,ashfall/cli,cpuguy83/cli,docker/cli,docker/cli,riyazdf/cli,Zebrilee/cli,Zebrilee/cli,ashfall/cli,riyazdf/cli,cpuguy83/cli,thaJeztah/cli,e11137/cli