Merge pull request #104 from asottile/patch-1

fix typo

Author: grantjenks

docs/performance.rst

@@ -211,7 +211,7 @@ Deleting objects at random using :func:`SortedList.__delitem__`.
 __getitem__
 ...........
 
-Retrieving ojbects by index using :func:`SortedList.__getitem__`.
+Retrieving objects by index using :func:`SortedList.__getitem__`.
 
 .. image:: _static/SortedList-getitem.png