man: keyfile: improve explanation of the format and routes properties

Íñigo Huguet requested to merge ih/keyfile-routes-doc into main


Improve explanation of the keyfile format so it's easier to understand it.

Also complete the explanation about how to define routes and routing-rules.


Please read before opening the merge request. In particular, check that:

  • the subject for all commits is concise and explicative
  • the message for all commits explains the reason for the change
  • the source is properly formatted
  • any relevant documentation is up to date
  • you have added unit tests if applicable
Edited by Íñigo Huguet

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