Fix typo.

Doc/whatsnew/whatsnew23.tex

@@ -744,7 +744,7 @@ or use them directly in subscripts:
 \end{verbatim}
 
 To make implementing sequences that support extended slicing in Python
-easier, slice ojects now have a method \method{indices} which given
+easier, slice objects now have a method \method{indices} which given
 the length of a sequence returns \code{(start, stop, step)} handling
 omitted and out-of-bounds indices in a manner consistent with regular
 slices (and this innocuous phrase hides a welter of confusing