RFR 8157992: Improve jlink help message on optimization-related options

[Alan Bateman]

On 02/09/2016 07:07, Sundararajan Athijegannathan wrote:

> Please review http://cr.openjdk.java.net/~sundar/8157992/webrev.01/ 
> for https://bugs.openjdk.java.net/browse/JDK-8157992
>
"details" should have one "d" :-)   Looks fine otherwise.