hg: lambda/lambda/jdk: more javadoc

[mike.duigou at oracle.com]

Changeset: 15c1d002a597
Author:    mduigou
Date:      2012-07-18 16:44 -0700
URL:       http://hg.openjdk.java.net/lambda/lambda/jdk/rev/15c1d002a597

more javadoc

! src/share/classes/java/util/Optional.java
! src/share/classes/java/util/functions/BiMapper.java
! src/share/classes/java/util/streams/MapStream.java
! src/share/classes/java/util/streams/MapStreamOps.java