Seeing more customers use TLS and a non 23 port, so documenting the defaults for what to override

[Joe-Winchester]

PR type

What type of changes does your PR introduce to Zowe? Put an x in the box that applies to this PR. If you're unsure about any of them, don't hesitate to ask.

• Feature

Changes proposed in this PR

• Add comments to explain how to configure the Zowe Desktp TN3270 app to use an alternative port number and protocol.

Does this PR introduce a breaking change?

• Yes
• No

Does this PR add or change a YAML parameter?

• Yes
• No

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[Martin-Zeithaml]

We have documented those variables here:
https://docs.zowe.org/stable/user-guide/mvd-3270/

Maybe we can update that chapter or provide better examples there.