fix link

Author: shuangela

source/atlas-search.txt

@@ -51,7 +51,7 @@ parameter.
    on :atlas:`MongoDB Atlas </>` clusters running v4.2 or later that are
    covered by an :atlas:`Atlas search index </reference/atlas-search/index-definitions/>`.
    Learn more about the required setup and the functionality of this operator
-   from the :ref:`Atlas Search <kotlin-sync-atlas-search>` documentation.
+   from the :atlas:`Atlas Search </atlas-search/>` documentation.
 
 Before running an Atlas Search query, you must create an Atlas Search index
 on your collection. To learn how to programmatically create an Atlas Search