Update docs/configuring-playbook-bot-matrix-registration-bot.md: fix the service name

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

docs/configuring-playbook-bot-matrix-registration-bot.md

@@ -75,7 +75,7 @@ just run-tags bot-matrix-registration-bot-clean-cache
 
 ## 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-registration-bot`.
+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-matrix-registration-bot`.
 
 ### Increase logging verbosity