Fix typo errors
Fix typo errors

This patch is to fix some typo errors in rest_api_version_history.rst.

Change-Id: I64ba7ce3844dac01a227e9898f2f14f8af3da51f

eharney/cinder,openstack/cinder,Datera/cinder,mahak/cinder,mahak/cinder,Datera/cinder,j-griffith/cinder,openstack/cinder,eharney/cinder,phenoxim/cinder,j-griffith/cinder,phenoxim/cinder