Add comment to local describing how to change logger level. Also update docs to be consistent with this change.

docs/development/custom/logging.md

@@ -12,4 +12,22 @@ logger = get_extension_logger(__name__)
 ```
 
 This works by creating a child logger of the extension logger which propagates all log entries
-to the parent (extensions) logger.
+to the parent (extensions) logger.
+
+## Changing the Logging Level
+By default, the extension logger's level is set to `DEBUG`. 
+To change this, uncomment (or add) the following line in `local.py`.
+
+```python
+LOGGING['handlers']['extension_file']['level'] = 'INFO'
+```
+*(Remember to restart your supervisor workers after changes to `local.py`)*
+
+This will change the logger's level to the level you define.
+
+Options are: *(all options accept entries of levels listed below them)*
+* `DEBUG`
+* `INFO`
+* `WARNING`
+* `ERROR`
+* `CRITICAL`