Add hint for Debian Bookworm ZFS Root Networking

Note that you may need to have appropriate firmware and networking
utilities installed to have a working network upon reboot. This is
varied so don't be overly specific but do point it out.

Adding this as I was caught out because my wifi adapter needed this on
my most recent installation.

Signed-off-by: Ben Walton <[email protected]>

Author: bdwalton

docs/Getting Started/Debian/Debian Bookworm Root on ZFS.rst

@@ -565,6 +565,8 @@ Step 4: System Configuration
 
    Customize this file if the system is not a DHCP client.
 
+   **Hint:** You may need to install firmware-linux-* packages for your adapter and other wireless network utilities as well.
+
 #. Configure the package sources::
 
      vi /mnt/etc/apt/sources.list