RFR: 8286189 G1: Change "wasted" memory to "unused" memory in reporting [v2]

[Thomas Schatzl]

On Thu, 5 May 2022 20:30:06 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Change available -> total
>
> Minor comment.

Thanks @albertnetymk @walulyai for your reviews

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PR: https://git.openjdk.java.net/jdk/pull/8550