hg: kulla/dev/langtools: 8131307: (partial) Update docs to refer to Snippet rather than Key

[robert.field at oracle.com]

Changeset: c278ea6c454f
Author:    rfield
Date:      2015-07-15 16:34 -0700
URL:       http://hg.openjdk.java.net/kulla/dev/langtools/rev/c278ea6c454f

8131307: (partial) Update docs to refer to Snippet rather than Key

! src/jdk.jshell/share/classes/jdk/jshell/JShell.java
! src/jdk.jshell/share/classes/jdk/jshell/Snippet.java