RFR: Minor cleanups after the JBS re-write [v3]

[Stefan Karlsson]

On Tue, 27 Jun 2023 22:50:28 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

>> Using markdown tables instead of html tables.
>> Added a separate style for JBS values.
>> Minor language fixes to make it the same style as the rest of the guide.
>> Clarified some sentences.
>> Added the label jep-superseded to the dictionary.
>
> Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Added note about affects version

Thanks for updating the text.

-------------

Marked as reviewed by stefank (no project role).

PR Review: https://git.openjdk.org/guide/pull/106#pullrequestreview-1502469004