RFR: 8272725: G1: add documentation on needs_remset_update_t vs bool [v2]

[Albert Mingkun Yang]

On Fri, 20 Aug 2021 11:22:48 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Simple type change in `struct G1HeapRegionAttr`.
>> 
>> Test: hotspot_gc
>
> Albert Mingkun Yang has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - review
>  - Revert "boolean"
>    
>    This reverts commit 2a23beb0549a928ae3876070dbdcf5a153c0703d.

Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/5188