RFR: 7903426: jcstress: Polish README.md [v2]

[Johnny Lim]

On Thu, 2 Feb 2023 12:18:32 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Johnny Lim has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Apply suggestions
>
> Thank you. This is good, apart from two comments.

@shipilev Thanks for the feedback!

I applied your suggestions in aa63fdf.

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PR: https://git.openjdk.org/jcstress/pull/131