[ci skip] feature/session: Update session lib doc title
It's not a driver itself ...
diff --git a/user_guide_src/source/libraries/sessions.rst b/user_guide_src/source/libraries/sessions.rst
index 3ca5aad..972c400 100644
--- a/user_guide_src/source/libraries/sessions.rst
+++ b/user_guide_src/source/libraries/sessions.rst
@@ -1,6 +1,6 @@
-##############
-Session Driver
-##############
+###############
+Session Library
+###############
The Session class permits you maintain a user's "state" and track their
activity while they browse your site.