RFR: CODETOOLS-7903024: Improve docs and impl for jtreg -show option

Wed Sep 15 22:48:56 UTC 2021

On Wed, 15 Sep 2021 21:58:30 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

> This is a PR to ...
> 
> * improve the`-show` option to allow a section name to be specified as well as a stream name
> * improve the command-line help for `-show`, to emphasize that it displays the unencoded stream contents
> * improve the FAQ with related new questions and links

Marked as reviewed by iris (Reviewer).

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PR: https://git.openjdk.java.net/jtreg/pull/26