Updated openstack/openstack
Project: openstack/ceilometer  1821149e7906bad9719073a31b344a373d371838

Fix typos in transformer docstrings

Aggregator and accumulator transformers have some typos in their
docstrings, this patch fixes this.

Change-Id: I0b9773fcd94d3b3fb42ca9182b4de186376a2d03