Change example networks

[oscrx]

- What I did
Change the example networks to allowed private ranges (192.168.0.0/16) according to RFC1918.
- How I did it
With the editor.
- How to verify it
Check the diff.
- Description for the changelog
Change the network example to something allowed.

- A picture of a cute animal (not mandatory but encouraged)

[GordonTheTurtle]

Please sign your commits following these rules:
https://github.com/moby/moby/blob/master/CONTRIBUTING.md#sign-your-work
The easiest way to do this is to amend the last commit:

$ git clone -b "patch-1" git@github.com:oscrx/cli.git somewhere
$ cd somewhere
$ git commit --amend -s --no-edit
$ git push -f

Amending updates the existing PR. You DO NOT need to open a new one.

[thaJeztah]

changes itself look good, but could you sign-off your commit, otherwise CI won't pass and we won't be able to accept the PR (our bot provided some instructions above); also see https://github.com/docker/cli/blob/master/CONTRIBUTING.md#sign-your-work

[oscrx]

Excuse me, I must not have payed enough attention. It should be fine now.

[thaJeztah]

looking good, thanks!

LGTM