Update docs/maintenance-and-troubleshooting.md: use the common header text

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

docs/maintenance-and-troubleshooting.md

@@ -22,7 +22,7 @@ To view systemd-journald logs using [journalctl](https://man.archlinux.org/man/j
 sudo journalctl -fu matrix-synapse
 ```
 
-## Increasing Synapse logging
+## Increase logging verbosity
 
 Because the [Synapse](https://github.com/element-hq/synapse) Matrix server is originally very chatty when it comes to logging, we intentionally reduce its [logging level](https://docs.python.org/3/library/logging.html#logging-levels) from `INFO` to `WARNING`.