hg: kulla/dev/langtools: Add code comments

[robert.field at oracle.com]

Changeset: ccfb89c6c79d
Author:    rfield
Date:      2015-08-19 20:12 -0700
URL:       http://hg.openjdk.java.net/kulla/dev/langtools/rev/ccfb89c6c79d

Add code comments

! src/jdk.jshell/share/classes/jdk/internal/jshell/tool/JShellTool.java
! src/jdk.jshell/share/classes/jdk/jshell/CompletenessAnalyzer.java
! src/jdk.jshell/share/classes/jdk/jshell/GeneralWrap.java
! src/jdk.jshell/share/classes/jdk/jshell/JDIEnv.java
! src/jdk.jshell/share/classes/jdk/jshell/JDIEventHandler.java