[7.11] Fix async documentation link

sethmlarson · web-flow · commit 49181f521d9d · 2021-01-21T13:57:52.000-06:00
diff --git a/docs/sphinx/index.rst b/docs/sphinx/index.rst
@@ -23,7 +23,7 @@ the ``async`` extra:
 
     $ python -m pip install elasticsearch[async]
 
-Read more about `how to use asyncio with this project <async>`_.
+Read more about `how to use asyncio with this project <async.html>`_.
 
 
 Compatibility
