RFR: CODETOOLS-7903279: doc updates

[Ludvig Janiuk]

On Thu, 1 Sep 2022 21:24:02 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

> Please review some updates to the FAQ and command-line help to address some recent suggestions for docs updates

Very good edits. 

> You can further refine the set of tests to be run in various ways.

What are those ways? Ideally, document the whole available sytax to empower the reader to use jtreg to its full extent. But if there it any reason for not doing that, then at least point to the reader to the right code files to look in so they can try reading the code for themselves.

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PR: https://git.openjdk.org/jtreg/pull/109