Replaced one TODO with better javadoc, and two others with a JIRA
Replaced one TODO with better javadoc, and two others with a JIRA

jyemin/mongo-java-driver,PSCGroup/mongo-java-driver,rozza/mongo-java-driver,gianpaj/mongo-java-driver,rozza/mongo-java-driver,jsonking/mongo-java-driver,kay-kim/mongo-java-driver,jsonking/mongo-java-driver,jyemin/mongo-java-driver