RFR (M): 8085885: address Javadoc warnings in Nashorn source code

[Marcus Lagergren]

+1 - Thanks for this cleanup!

> On 08 Jun 2015, at 10:34, Michael Haupt <michael.haupt at oracle.com> wrote:
> 
> Dear all,
> 
> please review and sponsor this (doc-only) change.
> RFE: https://bugs.openjdk.java.net/browse/JDK-8085885
> Webrev: http://cr.openjdk.java.net/~mhaupt/8085885/webrev.00
> 
> This fixes Javadoc warnings, improves formatting in Javadoc generated from the affected files, and reformats them for on-screen reading.
> 
> Thanks,
> 
> Michael
> 
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> 
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