Merge pull request django-haystack#837 from nicholasserra/signals-docs-fix

Tiny docs fix in signal_processors example code

Author: bigjust

docs/signal_processors.rst

@@ -100,7 +100,7 @@ other updates to the management commands, you'd implement the following code::
     from haystack import signals
 
 
-    class UserOnlySignalProcessor(BaseSignalProcessor):
+    class UserOnlySignalProcessor(signals.BaseSignalProcessor):
         def setup(self):
             # Listen only to the ``User`` model.
             models.signals.post_save.connect(self.handle_save, sender=User)