Fix settings docs

* Remove comment in ``debug_toolbar/settings.py`` that was invalidated in a8fa2cf.
* Fix documented default for ``DISABLE_PANELS``.

Author: adamchainz

debug_toolbar/settings.py

@@ -2,12 +2,6 @@
 
 from django.conf import settings
 
-# Always import this module as follows:
-# from debug_toolbar import settings [as dt_settings]
-
-# Don't import directly CONFIG or PANELs, or you will miss changes performed
-# with override_settings in tests.
-
 
 CONFIG_DEFAULTS = {
     # Toolbar options

docs/configuration.rst

@@ -54,7 +54,14 @@ Toolbar options
 
 * ``DISABLE_PANELS``
 
-  Default: ``{'debug_toolbar.panels.redirects.RedirectsPanel'}``
+  Default:
+
+  .. code-block:: python
+
+      {
+          "debug_toolbar.panels.profiling.ProfilingPanel",
+          "debug_toolbar.panels.redirects.RedirectsPanel",
+      }
 
   This setting is a set of the full Python paths to each panel that you
   want disabled (but still displayed) by default.