RFR: Extend documentation regarding logging [v7]

[Johan Sjölen]

On Mon, 27 Feb 2023 11:04:08 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

>> Hi!
>> 
>> Here's some suggested improvements to the logging documentation. It's currently just a draft, but please feel welcome to come with any suggestions.
>
> Johan Sjölen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Mention Xlog:help instead of the source files

Thanks for all of the help!

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PR: https://git.openjdk.org/guide/pull/91