RFR: 8322321: Add man page doc for -XX:+VerifySharedSpaces [v3]

[Calvin Cheung]

On Wed, 20 Dec 2023 00:57:02 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> `VerifySharedSpaces` was disabled in [JDK-8221478](https://bugs.openjdk.org/browse/JDK-8221478) by default. We should add an entry in the "java" man page about the intended use for this flag.
>
> Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:
> 
>   @dholmes-ora review #2 - fixed typos

Marked as reviewed by ccheung (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/17152#pullrequestreview-1789919151