If you really need to use the snapshot version you'll have to get the javadocs yourself from the Maven snapshot repository:
Javadocs for the latest CI build (from HEAD, i.e. 2.0.0-SNAPSHOT at present) are also at:
http://jclouds-javadocs.elasticbeanstalk.com/See also the description of https://jclouds.ci.cloudbees.com/job/jclouds/
Regards ap