doc: whack sphinx documentation version
diff --git a/doc/conf.py b/doc/conf.py
index 9e6e6d3..7270b02 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -51,7 +51,7 @@
 # The short X.Y version.
 version = '3.3'
 # The full version, including alpha/beta/rc tags.
-release = '3.3.1'
+release = '3.3.x'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.