docs: implement TODO to describe CLI arguments in help output

[Hackpaul]

This PR improves the CLI help output by adding clearer descriptions for protocol arguments to enhance usability and readability.

[Hackpaul]

@m-vasiloma
@ansafargalieva
@DarioMaddaloni

Hi ,
just following up on this PR when you have time.

To better align my next contributions, I had a few quick questions about the project direction:

•Is EventHorizon intended to remain primarily a research prototype, or evolve into a production-grade tool?

•Would implementing graceful shutdown handling (e.g., SIGTERM support across the tarpit servers) be a meaningful addition at this stage?

Understanding the core aim will help me structure future work more appropriately.

Thanks.

[haydaramru]

showHelp() function currently covers telnet, upnp, and mqtt but is missing CoAP. Since it’s already wired up, mind adding it?

[Hackpaul]

Sure , thanks for mentioning it !.