Fixed #10152 -- Fixed typo in porting guide. Thanks eagle-eyed anonymous.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9795 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/releases/1.0-porting-guide.txt

@@ -415,7 +415,7 @@ Sessions
 Getting a new session key
 ~~~~~~~~~~~~~~~~~~~~~~~~~
 
-``SeesionBase.get_new_session_key()`` has been renamed to
+``SessionBase.get_new_session_key()`` has been renamed to
 ``_get_new_session_key()``. ``get_new_session_object()`` no longer exists.
 
 Fixtures