Updated openstack/openstack
Project: openstack/oslo.db  2ed2f6085a397fa2a406bfeebb3d1d8476fd50be

Fix Sphinx directive name

During the build of source code reference of Ceilometer Sphinx reported
the following error: Unknown directive type "code". The correct directive
is '.. code-block::' instead of '.. code::'. This was fixed in the
session.py. The other occurences of this directive were correct.

Change-Id: I7876d0c9e9614a688eb14d9da57bbdbf916a119a