RFR: 8345346: Shenandoah: Description of ShenandoahGCMode still refers to incremental update mode

[Y. Srinivas Ramakrishna]

On Mon, 2 Dec 2024 22:46:25 GMT, William Kemper <wkemper at openjdk.org> wrote:

> The incremental update mode has been removed and is no longer supported.

Marked as reviewed by ysr (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/22502#pullrequestreview-2474111019