RFR: 8339870: Remove yet more stale TODOs

[Kelvin Nilsen]

On Tue, 10 Sep 2024 17:12:13 GMT, William Kemper <wkemper at openjdk.org> wrote:

> Final round of TODO removal.
> * Move asterisk for pointer next to type, not variable
> * Remembered set verifier uses a small 'scanner' abstraction to simplify reading of read or write card table
> 
> ## Testing
> 
> GHA, Internal pipelines

Marked as reviewed by kdnilsen (Committer).

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PR Review: https://git.openjdk.org/shenandoah/pull/496#pullrequestreview-2293732714