Fixed #24149 -- Normalized tuple settings to lists.

docs/intro/reusable-apps.txt

@@ -159,10 +159,10 @@ this. For a small app like polls, this process isn't too difficult.
 
        1. Add "polls" to your INSTALLED_APPS setting like this::
 
-           INSTALLED_APPS = (
+           INSTALLED_APPS = [
                ...
                'polls',
-           )
+           ]
 
        2. Include the polls URLconf in your project urls.py like this::
 

docs/intro/tutorial01.txt

@@ -422,7 +422,7 @@ look like this:
 .. snippet::
     :filename: mysite/settings.py
 
-    INSTALLED_APPS = (
+    INSTALLED_APPS = [
         'django.contrib.admin',
         'django.contrib.auth',
         'django.contrib.contenttypes',
@@ -430,7 +430,7 @@ look like this:
         'django.contrib.messages',
         'django.contrib.staticfiles',
         'polls',
-    )
+    ]
 
 Now Django knows to include the ``polls`` app. Let's run another command: