hg: jdk9/sandbox/langtools: Javadoc tweaks per Jon's comments

[jan.lahoda at oracle.com]

Changeset: 89a07c1debbe
Author:    jlahoda
Date:      2015-06-24 08:29 +0200
URL:       http://hg.openjdk.java.net/jdk9/sandbox/langtools/rev/89a07c1debbe

Javadoc tweaks per Jon's comments

! src/jdk.compiler/share/classes/com/sun/tools/javac/platform/PlatformDescription.java
! src/jdk.compiler/share/classes/com/sun/tools/javac/platform/PlatformProvider.java
+ src/jdk.compiler/share/classes/com/sun/tools/javac/platform/package-info.java