RFR: 8269003: Update the java manpage for JDK 18

[Yumin Qi]

On Thu, 24 Jun 2021 23:12:35 GMT, David Holmes <dholmes at openjdk.org> wrote:

> There are some start of release changes needed to the manpage that were overlooked:
> 
> - updated "removed options" section to get rid of things removed in 17 (nothing is removed in 18)
> - update list of previous releases (corrected documentation title for JDK 13+)
> 
> The changes are easy to view in the nroff file so I didn't generate the html version.
> 
> Thanks,
> David

Marked as reviewed by minqi (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/4590