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-jitsi.md

@@ -17,7 +17,9 @@ You may need to open the following ports to your server:
 
 ## Adjusting DNS records
 
-By default, this playbook installs Jitsi on the `jitsi.` subdomain (`jitsi.example.com`) and requires you to create a CNAME record for `jitsi`. See [Configuring DNS](configuring-dns.md) for details about DNS changes.
+By default, this playbook installs Jitsi on the `jitsi.` subdomain (`jitsi.example.com`) and requires you to create a CNAME record for `jitsi`, which targets `matrix.example.com`.
+
+When setting, replace `example.com` with your own.
 
 ## Adjusting the playbook configuration
 
@@ -27,7 +29,7 @@ To enable Jitsi, add the following configuration to your `inventory/host_vars/ma
 jitsi_enabled: true
 ```
 
-### Adjusting the Jitsi URL
+### Adjusting the Jitsi URL (optional)
 
 By tweaking the `jitsi_hostname` variable, you can easily make the service available at a **different hostname** than the default one.