Update documentation description for count_range.
Update documentation description for count_range.

stipple/cassandra_new,cassandra-rb/cassandra,rightscale/cassandra,rightscale/cassandra,cassandra-rb/cassandra,rightscale/cassandra,cassandra-rb/cassandra,stipple/cassandra_new,cassandra-rb/cassandra,stipple/cassandra_new,stipple/cassandra_new