hg: jdk/sandbox: 8230626: Make UnknownFooException strings more informative

[chris.hegarty at oracle.com]

Changeset: f016cc0874f0
Author:    darcy
Date:      2019-09-04 15:49 -0700
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/f016cc0874f0

8230626: Make UnknownFooException strings more informative
Reviewed-by: jjg, mr

! src/java.compiler/share/classes/javax/lang/model/element/UnknownAnnotationValueException.java
! src/java.compiler/share/classes/javax/lang/model/element/UnknownElementException.java
! src/java.compiler/share/classes/javax/lang/model/type/UnknownTypeException.java