RFR: 8271868: Warn user when using mac-sign option with unsigned app-image. [v2]

[Andy Herrick]

On Thu, 5 Aug 2021 17:07:13 GMT, Andy Herrick <herrick at openjdk.org> wrote:

>> 8271868: Warn user when using mac-sign option with unsigned app-image.
>
> Andy Herrick has updated the pull request incrementally with one additional commit since the last revision:
> 
>   JDK-8271868: Warn user when using mac-sign option with unsigned app-image.

will fix this spelling error

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PR: https://git.openjdk.java.net/jdk/pull/5004