[3.0.x] Removed unnecessary code-block directives in various docs.

Backport of 5e00bd1f77 from master

docs/ref/contrib/staticfiles.txt

@@ -139,9 +139,7 @@ a more persistent way than providing the ``--ignore`` command option at each
 ``collectstatic`` invocation. Provide a custom :class:`~django.apps.AppConfig`
 class, override the ``ignore_patterns`` attribute of this class and replace
 ``'django.contrib.staticfiles'`` with that class path in your
-:setting:`INSTALLED_APPS` setting:
-
-.. code-block:: python
+:setting:`INSTALLED_APPS` setting::
 
     from django.contrib.staticfiles.apps import StaticFilesConfig
 

docs/ref/files/uploads.txt

@@ -73,9 +73,7 @@ Here are some useful attributes of ``UploadedFile``:
 .. note::
 
     Like regular Python files, you can read the file line-by-line by iterating
-    over the uploaded file:
-
-    .. code-block:: python
+    over the uploaded file::
 
         for line in uploadedfile:
             do_something_with(line)