Corrected release number format in 3.2.1 release notes.

docs/releases/3.2.1.txt

@@ -4,7 +4,7 @@ Django 3.2.1 release notes
 
 *Expected May 4, 2021*
 
-Django 3.2.1 fixes several bugs in 3.2.0.
+Django 3.2.1 fixes several bugs in 3.2.
 
 Bugfixes
 ========