wsgi: Fix docstring.

caucase/wsgi.py

@@ -642,7 +642,7 @@ class Application(object):
     """
     Verify user authentication.
 
-    Raises NotFound if authentication does not pass checks.
+    Raises SSLUnauthorized if authentication does not pass checks.
     On success, appends a "Cache-Control" header.
     """
     try: