RFR: JDK-8248687: JPackage test extension misspelled "extention"

[Alexey Semenyuk]

Looks good.

- Alexey

On 7/13/2020 4:26 PM, Andy Herrick wrote:
> please review trivial jpackage fix to issue [1] at [2]
>
> [1] https://bugs.openjdk.java.net/browse/JDK-8248687
>
> [2] http://cr.openjdk.java.net/~herrick/8248687/webrev.01/
>
> /Andy
>