Java 8 RFR 8020409: Clean up doclint problems in java.util package, part 1

[Brian Burkhalter]

Reviewers:

Issue   http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8020409
Webrev  http://cr.openjdk.java.net/~bpb/8020409/

Thanks,

Brian