hg: jdk/sandbox: flatmap-branch: add javadocs for methods

[julia.boes at oracle.com]

Changeset: 6d49a5f483fa
Author:    jboes
Date:      2020-03-30 16:45 +0100
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/6d49a5f483fa

flatmap-branch: add javadocs for methods

! src/java.base/share/classes/java/util/stream/DoubleStream.java
! src/java.base/share/classes/java/util/stream/IntStream.java
! src/java.base/share/classes/java/util/stream/LongStream.java
! src/java.base/share/classes/java/util/stream/Stream.java