Summary: Cleanup of javadoc -Xlint errors
Reviewed-by: lancea, mduigou, darcy, mullan, mchung

Summary: Clean up doclint errors and warnings in classes in java.util
Reviewed-by: darcy, chegar
Contributed-by: NBrian Burkhalter <brian.burkhalter@oracle.com>

Reviewed-by: chegar, ksrini

Summary: Avoids mostly benign but sometimes expensive race condition on initialization of UUID.numberGenerator which is used by UUID.randomUUID()
Reviewed-by: alanb, chegar

Summary: to use new InternalError constructor with cause chainning
Reviewed-by: alanb, ksrini, xuelei, neugens
Contributed-by: sebastian.sickelmann@gmx.de

Reviewed-by: dholmes

Reviewed-by: mduigou, jjb, alanb, briangoetz, dholmes, peterjones
Contributed-by: NDaniel Aioanei <danielaioanei@google.com>

Reviewed-by: darcy, weijun