hg: jdk9/sandbox/jdk: More touchups for better coverage/docs

[aleksey.shipilev at oracle.com]

Changeset: 6b77a8459bcc
Author:    shade
Date:      2015-11-19 23:45 +0300
URL:       http://hg.openjdk.java.net/jdk9/sandbox/jdk/rev/6b77a8459bcc

More touchups for better coverage/docs

! src/java.base/share/classes/java/lang/invoke/StringConcatFactory.java