Update the default chunk size in comment
Update the default chunk size in comment

Update the comment to make it consistent with the code.
rozza/mongo-java-driver,jsonking/mongo-java-driver,PSCGroup/mongo-java-driver,gianpaj/mongo-java-driver,jyemin/mongo-java-driver,jsonking/mongo-java-driver,kay-kim/mongo-java-driver,jyemin/mongo-java-driver,rozza/mongo-java-driver