Fixes indentation on prerequisites.md

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

docs/prerequisites.md

@@ -8,11 +8,11 @@ To install Matrix services using this Ansible playbook, you need:
   - **Debian** (10/Buster or newer)
   - **Ubuntu** (18.04 or newer, although [20.04 may be problematic](ansible.md#supported-ansible-versions) if you run the Ansible playbook on it)
 
-Generally, newer is better. We only strive to support released stable versions of distributions, not betas or pre-releases. This playbook can take over your whole server or co-exist with other services that you have there.
+  Generally, newer is better. We only strive to support released stable versions of distributions, not betas or pre-releases. This playbook can take over your whole server or co-exist with other services that you have there.
 
-This playbook somewhat supports running on non-`amd64` architectures like ARM. See [Alternative Architectures](alternative-architectures.md).
+  This playbook somewhat supports running on non-`amd64` architectures like ARM. See [Alternative Architectures](alternative-architectures.md).
 
-If your distro runs within an [LXC container](https://linuxcontainers.org/), you may hit [this issue](https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/703). It can be worked around, if absolutely necessary, but we suggest that you avoid running from within an LXC container.
+  If your distro runs within an [LXC container](https://linuxcontainers.org/), you may hit [this issue](https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/703). It can be worked around, if absolutely necessary, but we suggest that you avoid running from within an LXC container.
 
 - `root` access to your server (or a user capable of elevating to `root` via `sudo`).