RFR: 8281210: Add manpage changes for PAC-RET protection on Linux/AArch64

[David Holmes]

On Tue, 1 Mar 2022 01:13:14 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> Please review this trivial update to apply the manpage changes from JDK-8277204. Those changes had to be applied to the closed markdown sources and then the regenerated output brought back into OpenJDK. There are some minor formatting changes to suit the prevailing style of the runtime flags section, and some incidental line break differences introduced by the pandoc tool.
>> 
>> Thanks,
>> David
>
> LGTM and I agree this is trivial.

Thanks @iklam !

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PR: https://git.openjdk.java.net/jdk/pull/7641