Rocky9: Add section on routing rules

[jovial]

Unsure if this is version specific as I asked on Slack and @cityofships said he didn't see similar issues on SMS

Last metadata expiration check: 21:25:18 ago on Thu Oct 12 14:41:23 2023.
Installed Packages
Name         : NetworkManager
Epoch        : 1
Version      : 1.42.2
Release      : 8.el9_2
Architecture : x86_64
Size         : 6.0 M
Source       : NetworkManager-1.42.2-8.el9_2.src.rpm
Repository   : @System
From repo    : baseos
Summary      : Network connection manager and user applications
URL          : https://networkmanager.dev/
License      : GPLv2+ and LGPLv2+
Description  : NetworkManager is a system service that manages network interfaces and
             : connections based on user or automatic configuration. It supports
             : Ethernet, Bridge, Bond, VLAN, Team, InfiniBand, Wi-Fi, mobile broadband
             : (WWAN), PPPoE and other devices, and supports a variety of different VPN
             : services.