docs: Added reference and link to configure instructions for docker-c…

…ompose… (#18815)

Co-authored-by: Jacob Roope <[jacobcroope@gmail.com]>

docs/docs/installation/configuring-superset.mdx

@@ -10,8 +10,9 @@ version: 1
 ### Configuration
 
 To configure your application, you need to create a file `superset_config.py` and add it to your
-`PYTHONPATH`. Here are some of the parameters you can set in that file:
+`PYTHONPATH`. If your applcation was installed using docker-compose an alternative configuration is required. See [https://github.com/apache/superset/tree/master/docker#readme](https://github.com/apache/superset/tree/master/docker#readme) for details.
 
+Here are some of the parameters you can set in that file:
 ```
 # Superset specific config
 ROW_LIMIT = 5000