Add information about specific VRF routing

As this thread states:
https://forum.vyos.io/t/system-name-server-vrf-aware/6710

There is no way to force system DNS traffic via a specific VRF, which is a pretty common scenario.
For example one could expect that all system services like DNS, auth, syslog, NTP, etc would use the management VRF (as specified by the user).
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Stefan Lindblom 2021-04-12 14:32:09 +02:00 committed by GitHub
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@ -4,6 +4,8 @@
System DNS
##########
.. warning:: If you are configuring a VRF for management purposes, there is
currently no way to force system DNS traffic via a specific VRF.
This section describes configuring DNS on the system, namely: