Fixed spelling mistakes in docs.

docs/topics/class-based-views/mixins.txt

@@ -219,7 +219,7 @@ processing to work on a particular object, identified from the URL,
 we'll want the functionality provided by
 :class:`~django.views.generic.detail.SingleObjectMixin`.
 
-We'll demonstrate this with the publisher modelling we used in the
+We'll demonstrate this with the publisher modeling we used in the
 :doc:`generic class-based views introduction<generic-display>`.
 
 .. code-block:: python

docs/topics/forms/formsets.txt

@@ -588,8 +588,8 @@ The ``manage_articles.html`` template might look like this:
         </table>
     </form>
 
-However the above can be slightly shortcutted and let the formset itself deal
-with the management form:
+However there's a slight shortcut for the above by letting the formset itself
+deal with the management form:
 
 .. code-block:: html+django
 

docs/topics/migrations.txt

@@ -442,7 +442,7 @@ available at the top level of a module it is not serializable.
 ``kwargs`` should be a dict of keyword arguments to pass to your class'
 ``__init__`` method. Every value should itself be serializable.
 
-Django will write out the value as an instatiation of your class with the
+Django will write out the value as an instantiation of your class with the
 given arguments, similar to the way it writes out references to Django fields.
 
 

docs/topics/testing/advanced.txt

@@ -354,7 +354,7 @@ Attributes
     the individual tests and format the results. By default it is set to
     ``unittest.TextTestRunner``. Despite the unfortunate similarity in
     naming conventions, this is not the same type of class as
-    ``DiscoverRunner``, which covers a broader set of responsibilites. You
+    ``DiscoverRunner``, which covers a broader set of responsibilities. You
     can override this attribute to modify the way tests are run and reported.
 
 .. attribute:: DiscoverRunner.test_loader