Docs: Update leadership transfer options docs

[habibimustafa]

Before:

Remove Peer Options:

  -peer-address="IP:port"
    Transfer leadership to the Nomad server with given Raft address.

  -peer-id="id"
    Transfer leadership to the Nomad server with given Raft ID.

After

Transfer Leadership Options:

  -peer-address="IP:port"
    Transfer leadership to the Nomad server with given Raft address.

  -peer-id="id"
    Transfer leadership to the Nomad server with given Raft ID.

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[aimeeu]

Thanks for this update! Approving from a language standpoint, but since this is a code file, one of the maintainers should also approve.

[tgross]

Thanks!