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

[Iris Clark]

On Wed, 24 Aug 2022 01:21:10 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.

Marked as reviewed by iris (Reviewer).

src/share/doc/javatest/regtest/faq.md line 1025:

> 1023: awhile in case the files go away in a timely manner.
> 1024: 
> 1025: ### My tests take a long time to run: how do I find where the time goes?

You might want to consider breaking up your answer into two parts.  The first part answers the question "My **test** takes a long time to run: how to I find where the time goes?" The second part answers "How do I find the longest-running tests in my test suite?"

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