Link fix

Author: mcmorisi

source/indexes/single-field-index.txt

@@ -93,4 +93,4 @@ guide, see the following API Documentation:
 
 - `find() <{+api+}/mongodb-driver-kotlin-sync/com.mongodb.kotlin.client/-mongo-collection/find.html>`__
 - `filter() <{+api+}/mongodb-driver-kotlin-sync/com.mongodb.kotlin.client/-find-iterable/filter.html>`__
-- `sort() <{+api+}/mongodb-driver-kotlin-sync/com.mongodb.kotlin.client/-find-iterable/sort.html/>`__
+- `sort() <{+api+}/mongodb-driver-kotlin-sync/com.mongodb.kotlin.client/-find-iterable/sort.html>`__