Update docs/configuring-dns.md: iterate

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

docs/configuring-dns.md

@@ -4,7 +4,7 @@
 
 To set up Matrix on your domain, you'd need to do some DNS configuration.
 
-## DNS settings for server delegation
+## DNS setting for server delegation (optional)
 
 In the sample `vars.yml` ([`examples/vars.yml`](../examples/vars.yml)), we recommend to use a short user identifier like `@<username>:example.com`.
 
@@ -15,9 +15,9 @@ As we discuss in [Server Delegation](howto-server-delegation.md), server delegat
 - Setting up a `/.well-known/matrix/server` file on the base domain (`example.com`)
 - Setting up a `_matrix._tcp` DNS SRV record
 
-For simplicity reasons, this playbook recommends you to set up server delegation via a `/.well-known/matrix/server` file, instead of using DNS SRV records.
+For simplicity reasons, this playbook recommends you to set up server delegation via a `/.well-known/matrix/server` file, instead of using a DNS SRV record.
 
-If you choose the recommended method, you do not need to configure DNS SRV records to enable server delegation. We'll revisit this topic in [finalizing the installation](installing.md#finalize-the-installation), after installing and starting Matrix services.
+If you choose the recommended method, you do not need to configure the DNS record to enable server delegation. You will need to add a necessary configuration later, when you [finalize the installation](installing.md#finalize-the-installation) after installing and starting Matrix services.
 
 On the other hand, if you choose the other method (setting the DNS SRV record), you need to configure the additional DNS record. Take a look at this documentation for more information: [Server Delegation via a DNS SRV record (advanced)](howto-server-delegation.md#server-delegation-via-a-dns-srv-record-advanced)