update version of documentation to the latest release (v3.2.1)

Signed-off-by: Matthieu Gallien <matthieu_gallien@yahoo.fr>

doc/conf.py

@@ -50,7 +50,7 @@ copyright = u'2013-2021, The Nextcloud developers'
 # The short X.Y version.
 version = '3.2'
 # The full version, including alpha/beta/rc tags.
-release = '3.2.0'
+release = '3.2.1'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.