Configured to mirror server url about {focal,jammy}-security suite

Bug Description

Ubuntu server focal and jammy are configured to mirror repository about security pockets. However, I know that security pocket does not use mirror server traditionally. The tips is wrote down at
https://wiki.ubuntu.com/SecurityTeam/FAQ#What_repositories_and_pockets_should_I_use_to_make_sure_my_systems_are_up_to_date.3F

I confirmed this matter is on server edition of focal and jammy. I think desktop edition is correct.

Is this expected behavior about server edition?

```
desktop % grep security < /etc/apt/sources.list
## review or updates from the Ubuntu security team.
## security team.
## or updates from the Ubuntu security team.
deb http://security.ubuntu.com/ubuntu focal-security main restricted
# deb-src http://security.ubuntu.com/ubuntu eoan-security main restricted
deb http://security.ubuntu.com/ubuntu focal-security universe
# deb-src http://security.ubuntu.com/ubuntu eoan-security universe
deb http://security.ubuntu.com/ubuntu focal-security multiverse
# deb-src http://security.ubuntu.com/ubuntu eoan-security multiverse
```

```
server~$ grep security < /etc/apt/sources.list
## review or updates from the Ubuntu security team.
## security team.
## or updates from the Ubuntu security team.
deb http://jp.archive.ubuntu.com/ubuntu focal-security main restricted
# deb-src http://jp.archive.ubuntu.com/ubuntu focal-security main restricted
deb http://jp.archive.ubuntu.com/ubuntu focal-security universe
# deb-src http://jp.archive.ubuntu.com/ubuntu focal-security universe
deb http://jp.archive.ubuntu.com/ubuntu focal-security multiverse
# deb-src http://jp.archive.ubuntu.com/ubuntu focal-security multiverse
```