DOCSP-27280 Fixes Rolling Index typo (#2375) (#2391)

Co-authored-by: Kenneth P. J. Dyer <[email protected]>

Co-authored-by: Kenneth P. J. Dyer <[email protected]>

Author: kennethdyer

source/tutorial/build-indexes-on-sharded-clusters.txt

@@ -116,7 +116,7 @@ for the collection. Once refreshed, run
 :method:`db.collection.getShardDistribution()` for the collection you
 wish to build the index.
 
-For example, if you want to an ascending index
+For example, if you want to create an ascending index
 on the ``records`` collection in the ``test`` database:
 
 .. code-block:: javascript