docs(wiki): Document new log_janitor.max_files setting

wiki/Settings-Reference.md

@@ -78,3 +78,18 @@ repository:
   repository. If not specified, only the `branch` controls what revision is used in the repo.
 
 [official_repo]: https://github.com/TRaSH-/Guides
+
+## Log Janitor Settings
+
+The log janitor is responsible for cleaning up logs generated by Recyclarr each time a command is
+executed. These settings allow the user to alter the default cleanup behavior. For example, you may
+want logs to be cleaned up sooner or keep log files around longer.
+
+```yml
+log_janitor:
+  max_files: 20
+```
+
+- `max_files` *(Default: `20`)*<br>
+  The maximum number of log files to keep. If there are more log files than the max allowed here,
+  Log Janitor will remove the oldest log files.