[PATCH] Add missing reference to "show route in" in cli-help and doc

[Maria Matejka]

Hi Johannes!

On 3/18/23 14:33, Johannes Moos wrote:
> please find a patch attached that adds missing references to "show route in" (introduced with v2.0.9) in the cli-help and doc.

Commited with some additional doc text: 
https://gitlab.nic.cz/labs/bird/-/commit/231c63851e3a56201dd02abfbf3fce47a80f8ae0

Thank you for your contribution!

Maria