Update docs/configuring-playbook-bot-buscarron.md: add the common expression for linking to the documentation

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

docs/configuring-playbook-bot-buscarron.md

@@ -4,6 +4,8 @@ The playbook can install and configure [Buscarron](https://github.com/etkecc/bus
 
 Buscarron is bot that receives HTTP POST submissions of web forms and forwards them to a Matrix room.
 
+See the project's [documentation](https://github.com/etkecc/buscarron/blob/main/README.md) to learn what it does and why it might be useful to you.
+
 ## Adjusting DNS records
 
 By default, this playbook installs Buscarron on the `buscarron.` subdomain (`buscarron.example.com`) and requires you to create a CNAME record for `buscarron`, which targets `matrix.example.com`.
@@ -103,8 +105,6 @@ Here is an example for the `contact` form:
 
 If you get banned, you'd need to restart the process by running the playbook with `--tags=start` or running `systemctl restart matrix-bot-buscarron` on the server.
 
-You can also refer to the upstream [documentation](https://github.com/etkecc/buscarron).
-
 ## Troubleshooting
 
 As with all other services, you can find the logs in [systemd-journald](https://www.freedesktop.org/software/systemd/man/systemd-journald.service.html) by logging in to the server with SSH and running `journalctl -fu matrix-bot-buscarron`.