Update docs for DNS settings etc. (#3936)

* Update docs for DNS settings of the services which need its CNAME record by default

- Buscarron
- Go-NEB; fix a line on the instruction as well
- wsproxy
- Cinny
- Element Web
- Hydrogen
- SchildiChat Web
- Dimension
- Etherpad
- Jitsi
- ntfy
- Grafana
- rageshake
- Sygnal

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

* Update docs for DNS settings of the services which do not need its CNAME record by default

- matrix-alertmanager-receiver
- Honoroit
- maubot
- Heisenbridge
- Cactus Comments
- Matrix Authentication Service
- matrix-registration
- Sliding Sync proxy
- Synapse Admin
- synapse-usage-exporter

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

* Update docs for DNS settings: ma1sd

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

* Update docs for DNS settings: Email2Matrix

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

* Update docs for DNS settings: Postmoogle

Remove the table from configuring-dns.md altogether

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

* Update docs for Cinny and Dimension: adopt the common note

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

* Update docs/configuring-dns.md: add "Note" to the line on using Cloudflare DNS

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

---------

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

docs/configuring-playbook-email2matrix.md

@@ -8,10 +8,6 @@ See the project's [documentation](https://github.com/devture/email2matrix/blob/m
 
 ## Preparation
 
-## Adjusting DNS records
-
-It's not strictly necessary, but you may increase the chances that incoming emails reach your server by adding an `MX` record for `matrix.example.com`, as described in the [Configuring DNS](configuring-dns.md) documentation page.
-
 ### Port availability
 
 Ensure that port 25 is available on your Matrix server and open in your firewall.
@@ -54,6 +50,14 @@ Make sure that you and the sender user are part of the same room and that the se
 
 Take note of each room's room ID (different clients show the room ID in a different place). You'll need the room ID when [configuring the playbook](#adjusting-the-playbook-configuration) below.
 
+## Adjusting DNS records
+
+To increase the chances that incoming emails reach your server, you can set up a `MX` record for `matrix.example.com` that looks like this:
+
+| Type | Host     | Priority | Weight | Port | Target                             |
+|------|----------|----------|--------|------|------------------------------------|
+| MX   | `matrix` | 10       | 0      | -    | `matrix.example.com`               |
+
 ## Adjusting the playbook configuration
 
 To enable Email2Matrix, add the following configuration to your `vars.yml` file. Make sure to replace `ACCESS_TOKEN_FOR_EMAIL2MATRIX1_HERE` and `ACCESS_TOKEN_FOR_EMAIL2MATRIX2_HERE` with the ones created [above](#obtain-an-access-token).