[P2P] Revisit comments in the CLI broadcast logic

[Olshansk]

Objective

Update comments in app/client/cli/debug.go

Origin Document

This comment in #879

Goals

• Update documentation on the functionality for future developers

Deliverable

• [ ] Update comments
• [ ] Update implementation if applocable

Non-goals / Non-deliverables

• Nongoal #1
• Nongoal #2

General issue deliverables

• [ ] Update the appropriate CHANGELOG(s)
• [ ] Update any relevant local/global README(s)
• [ ] Update relevant source code tree explanations
• [ ] Add or update any relevant or supporting mermaid diagrams

Testing Methodology

• [ ] Task specific tests or benchmarks: make ...
• [ ] New tests or benchmarks: make ...
• [ ] All tests: make test_all
• [ ] LocalNet: verify a LocalNet is still functioning correctly by following the instructions at docs/development/README.md
• [ ] k8s LocalNet: verify a k8s LocalNet is still functioning correctly by following the instructions here

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Creator: @Olshansk Co-Owners: @bryanchriswhite