specify create one ref

Author: lindseymoore

source/indexes/compound-index.txt

@@ -120,5 +120,5 @@ To learn more about any of the methods discussed in this guide, see the
 following API documentation:
 
 - `indexes <{+api-root+}/Mongo/Collection.html#indexes-instance_method>`__
-- `create_one <{+api-root+}/Mongo/Index/View.html>`__
+- `create_one <{+api-root+}/Mongo/Index/View.html#create_one-instance_method>`__
 - `find <{+api-root+}/Mongo/Collection.html#find-instance_method>`__