doc: explain option --net-addr (Issue #260)

Nic Volanschirequested to merge
nomadic-labs/tezos:nic@net-addr-doc into master

Context

Solve Issue #260 by documenting option --net-addr while clearly stating that it cannot be used to publish a proxy host for incoming requests (which could be useful when running under NAT or in other virtual environments).

Manually testing the MR

Check that the option is documented clearly and accurately.

Checklist

  • Select suitable reviewers using the Reviewers field below.
Edited by Nic Volanschi

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