hg: amber/amber: adding @since annotations plus additional javadoc comments

[vicente.romero at oracle.com]

Changeset: 1f389923436d
Author:    vromero
Date:      2018-11-06 14:47 -0500
URL:       http://hg.openjdk.java.net/amber/amber/rev/1f389923436d

adding @since annotations plus additional javadoc comments

! src/java.base/share/classes/java/lang/Class.java
! src/java.base/share/classes/java/lang/Double.java
! src/java.base/share/classes/java/lang/Enum.java
! src/java.base/share/classes/java/lang/Float.java
! src/java.base/share/classes/java/lang/Integer.java
! src/java.base/share/classes/java/lang/Long.java
! src/java.base/share/classes/java/lang/String.java
! src/java.base/share/classes/java/lang/invoke/MethodHandle.java
! src/java.base/share/classes/java/lang/invoke/MethodType.java
! src/java.base/share/classes/java/lang/invoke/TypeDescriptor.java
! src/java.base/share/classes/java/lang/invoke/VarHandle.java