RFR: 8344592: GenShen: Remove unnecessary comments and changes

[Kelvin Nilsen]

On Tue, 19 Nov 2024 23:46:17 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Remove unnecessary comments and reduce granularity of access controls in shConcurrentGC.hpp.

Marked as reviewed by kdnilsen (Committer).

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PR Review: https://git.openjdk.org/shenandoah/pull/545#pullrequestreview-2449670345