RFR: CODETOOLS-7903261: Add FAQ entry about the time taken to run tests [v2]

Sat Aug 27 00:02:00 UTC 2022

On Fri, 26 Aug 2022 22:43:53 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> Please review an update to the FAQ, to add an entry about the information recorded in `.jtr` files about test execution times.
>
> Jonathan Gibbons has updated the pull request incrementally with one additional commit since the last revision:
> 
>   address review feedback; split recent entry into 2

Marked as reviewed by iris (Reviewer).

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PR: https://git.openjdk.org/jtreg/pull/106