[Docs] - Error in systemd setup configuration

### Issue Type

New Documentation Request

### Description

I'm running Debian 13.1.0 in a VM and built **Actual** from source, but I encountered an issue during the setup.

The documentation instructs to create the service file at:

`/etc/systemd/service/actual-server.service`

However, in the following steps, this path is misspelled in step 3.

The documentation currently says:

`3. Install and start the systemd unit file -> systemctl enable --now /etc/systemd/system/multi-user.target.wants/actual-server.service`

It should instead be:

`Install and start the systemd unit file -> systemctl enable --now /etc/systemd/service/multi-user.target.wants/actual-server.service`

Could you confirm the correct path or update the documentation accordingly?

### Documentation URL

https://actualbudget.org/docs/install/build-from-source#linux-systemd-setup

### Documentation Category

Installation & Configuration

### Expected/Desired Content

Install and start the systemd unit file -> systemctl enable --now /etc/systemd/service/multi-user.target.wants/actual-server.service

### Screenshots or Examples

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