RFR: 8272439: G1: add documentation to G1CardSetInlinePtr [v2]

[Albert Mingkun Yang]

On Fri, 13 Aug 2021 11:11:47 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Add some documentation to `class G1CardSetInlinePtr`, and simplify a field initialization in `G1CardSetConfiguration`.
>> 
>> Test: hotspot_gc
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/5108