[8u-dev] approval request for 8130307: improve Nashorn Javadoc target

[Sundararajan Athijegannathan]

Please approve.

Bug: https://bugs.openjdk.java.net/browse/JDK-8130307
jdk8u-dev webrev: http://cr.openjdk.java.net/~sundar/8130307/8u/webrev.00
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2015-July/004853.html

The patch won't apply cleanly on 8u nashorn as makefile diverged in 
jdk9-dev/nashorn. I had manually apply the diffs. Michael, please review 
the jdk8u backport webrev above...

Thanks,
-Sundar