Revert "fix list indentation - mkdocs expects four spaces"

This reverts commit 30a119387acdef9b10693e2eeb3dc0010baf7449.

docs/configuration.md

@@ -15,10 +15,10 @@ or applicable default will be utilized instead.
 - If you are running paperless on anything else, paperless will search
   for the configuration file in these locations and use the first one
   it finds:
-    - The environment variable `PAPERLESS_CONFIGURATION_PATH`
-    - `/path/to/paperless/paperless.conf`
-    - `/etc/paperless.conf`
-    - `/usr/local/etc/paperless.conf`
+  - The environment variable `PAPERLESS_CONFIGURATION_PATH`
+  - `/path/to/paperless/paperless.conf`
+  - `/etc/paperless.conf`
+  - `/usr/local/etc/paperless.conf`
 
 ## Required services