docs: add example system service tcp

[erlangparasu]

Does this PR introduce a user-facing change?

None

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[mheon]

We'd prefer not to document this without the use of TLS + certificate auth - not yet merged, see #24601 - due to the substantial security implications of an unprotected API socket (it effectively allows uncontrolled access to the system as the user Podman is being run as).

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