RFR: 8332849: Update doc/testing.{md,html} (spelling and stale information) [v2]

[Iris Clark]

On Fri, 24 May 2024 21:05:27 GMT, Mikael Vidstedt <mikael at openjdk.org> wrote:

>> Update the testing doc to remove some stale information (AOT_MODULES, removed in [JDK-8264805](https://bugs.openjdk.org/browse/JDK-8264805)) and fix some spelling issues.
>> 
>> Testing: tier1
>
> Mikael Vidstedt has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Revert change to deliberately misspelled variables

Marked as reviewed by iris (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/19375#pullrequestreview-2079262776