Added link to netcat official site and '-v' key to netcat command example

[ksemele]

Hello!
I added link to netcat official site and a very useful key -v at example command.

Why did I add this?

1. My installation did not include netcat out of the box and I had to search for what was meant.
2. When running the example as is (without an additional key) - it is absolutely unclear what is happening.

Example output of the command without a key, if the port is unavailable:

$ nc 127.0.0.1 6443

Example of command output with key, if port is unavailable:

nc 127.0.0.1 6443 -v
nc: connectx to 127.0.0.1 port 6443 (tcp) failed: Connection refused

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: ksemele / name: Alexey (2700ea0)

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[sftim]

/lgtm

[sftim]

Ideally, also mention that netcat is useful but optional, inside the section headed

## {{% heading "prerequisites" %}}

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 056ba5282030ff3c4707de830dc710f5bdeb3407

[dipesh-rawat]

Thanks for your contribution!
Congrats on your first PR 🎉

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dipesh-rawat

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