Update docs/configuring-playbook-user-verification-service.md: adopt the common section "Troubleshooting"

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

docs/configuring-playbook-user-verification-service.md

@@ -90,18 +90,6 @@ matrix_user_verification_service_uvs_pin_openid_verify_server_name: false
 
 This will instruct UVS to verify the OpenID token against any domain given in a request. Homeserver discovery is done via `.well-known/matrix/server` of the given domain.
 
-### Controlling the logging level (optional)
-
-To specify the logging level, add the following configuration to your `vars.yml` file:
-
-```yaml
-UVS_LOG_LEVEL: info
-```
-
-Replace `info` with one of the choices (they can be checked [here](https://github.com/winstonjs/winston#logging-levels)) to control the verbosity of the logs generated.
-
-If you have issues with a service, and are requesting support, the higher levels of logging will generally be more helpful.
-
 ### Extending the configuration
 
 There are some additional things you may wish to configure about the component.
@@ -125,6 +113,17 @@ The shortcut commands with the [`just` program](just.md) are also available: `ju
 
 ## 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-user-verification-service`.
+
+### Increase logging verbosity
+
+The default logging level for this component is `info`. If you want to increase the verbosity, add the following configuration to your `vars.yml` file and re-run the playbook:
+
+```yaml
+# See choices here: https://github.com/winstonjs/winston#logging-levels
+UVS_LOG_LEVEL: debug
+```
+
 ### TLS Certificate Checking
 
 If the Matrix Homeserver does not provide a valid TLS certificate, UVS will fail with the following error message: