Fix Sphynx syntax in the memory.rst document
diff --git a/README.rst b/README.rst
index 3eae020..0d868c6 100644
--- a/README.rst
+++ b/README.rst
@@ -1,4 +1,4 @@
-This is Python version 3.10.0 alpha 4
+This is Python version 3.10.0 alpha 5
 =====================================
 
 .. image:: https://travis-ci.com/python/cpython.svg?branch=master