Add comment to ufw firewall rule so it's easier to figure out what it's from in the future

[MadLittleMods]

Add comment to ufw firewall rule so it's easier to figure out what it's from and what it's for in the future.

When you're staring at sudo ufw status numbered, make it easier to figure out why the rule is there:

sudo ufw status numbered
Status: active

     To                         Action      From
     --                         ------      ----
[ 9] Anywhere (v6) on br-+      ALLOW IN    Anywhere (v6)              # (from Matrix Complement testing) Allow traffic from custom Docker networks to the host machine (host.docker.internal)

If you've already added the rule in the past, you can delete and re-add it:

1. Find the rule number: sudo ufw status numbered
2. sudo ufw delete 9
3. Re-add rule

Dev notes

Originally introduced in #388

---

If you additionally want to allow traffic from the default Docker network (docker0), here is that rule:

sudo ufw allow in on docker0 comment "Allow traffic from the default Docker network to the host machine (host.docker.internal)"

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