Update docs/configuring-dns.md and docs/prerequisites.md: add the common horizontal line

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

docs/configuring-dns.md

@@ -97,5 +97,6 @@ This is an optional feature for the optionally-installed [ma1sd service](configu
 
 To make the [postmoogle](configuring-playbook-bridge-postmoogle.md) email bridge enable its email sending features, you need to configure SPF (TXT), DMARC (TXT), DKIM (TXT) and MX records
 
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 When you're done with the DNS configuration and ready to proceed, continue with [Getting the playbook](getting-the-playbook.md).

docs/prerequisites.md

@@ -46,4 +46,6 @@ To install Matrix services using this Ansible playbook, you need:
   - the range `49152-49172/udp`: TURN over UDP
   - potentially some other ports, depending on the additional (non-default) services that you enable in the **configuring the playbook** step (later on). Consult each service's documentation page in `docs/` for that.
 
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 When ready to proceed, continue with [Configuring DNS](configuring-dns.md).