hg: jdk10/master: 8187982: Update SourceVersion to mention restricted keywords

[joe.darcy at oracle.com]

Changeset: ce5fd3ba3fea
Author:    darcy
Date:      2017-09-27 14:23 -0700
URL:       http://hg.openjdk.java.net/jdk10/master/rev/ce5fd3ba3fea

8187982: Update SourceVersion to mention restricted keywords
Reviewed-by: mcimadamore

! src/java.compiler/share/classes/javax/lang/model/SourceVersion.java
! src/java.compiler/share/classes/javax/lang/model/element/ModuleElement.java
! test/langtools/tools/javac/processing/model/TestSourceVersion.java