RFR: 8272067: Initial nroff manpage generation for JDK 18

[David Holmes]

On Fri, 6 Aug 2021 03:06:12 GMT, Joe Darcy <darcy at openjdk.org> wrote:

>> Please review this trivial update to the generated manpages that updates their version from "JDK 17" to "JDK 18-ea".
>> 
>> Thanks,
>> David
>
> Marked as reviewed by darcy (Reviewer).

Thanks for the review @jddarcy!

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PR: https://git.openjdk.java.net/jdk/pull/5028