RFR: Cleaned up internal links and added a note-style [v2]

[Jesper Wilhelmsson]

On Thu, 20 Jul 2023 19:07:12 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

>> Pandoc doesn't require internal links to have the second "link"-part of the markdown link, so removing that throughout the guide to make it slightly easier to read the source.
>> 
>> Added a new note-style to clean up the source slightly more, and enable a consistent style for notes.
>> 
>> Added comment about not closing JBS issues with open sub-tasks.
>> 
>> Added comment about using sub-tasks for problemlisting.
>
> Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Note about using sub-tasks for problemlisting

Thank you for the quick review!

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PR Comment: https://git.openjdk.org/guide/pull/110#issuecomment-1644469633