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

[Ioi Lam]

> `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

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17152/files
  - new: https://git.openjdk.org/jdk/pull/17152/files/c5a0288a..ca07c362

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17152&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17152&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17152.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17152/head:pull/17152

PR: https://git.openjdk.org/jdk/pull/17152