RFR: 8290049: Committers should be able to review for Shenandoah 8u

[Roman Kennke]

On Sun, 10 Jul 2022 17:37:59 GMT, Andrew John Hughes <andrew at openjdk.org> wrote:

> According to @rkennke, "it is sufficient to be a Committer in order to officially review Shenandoah PRs"
> 
> We should change the `jcheck` configuration to reflect this.

Looks reasonable. Thank you!

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Marked as reviewed by rkennke (Lead).

PR: https://git.openjdk.org/shenandoah-jdk8u/pull/4