RFR: 8373522: Remove expired flags in JDK 27

[Albert Mingkun Yang]

On Thu, 11 Dec 2025 21:31:07 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Please review these trivial start-of-release updates in relation to expired flags:
> 
> - the flag table is updated to remove entries for expired flags
> -  the Java man page is trivially updated
> 
> Thanks

`LockingMode` is still referenced in `phaseX.cpp`, just fyi.

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Marked as reviewed by ayang (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/28776#pullrequestreview-3574777031