RFR: 8350638: Make keyboard navigation more usable in API docs [v6]

[Hannes Wallnöfer]

On Thu, 6 Mar 2025 10:50:29 GMT, Nizar Benalla <nbenalla at openjdk.org> wrote:

>> Hannes Wallnöfer has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Add @bug id to tests
>
> Code looks fine, the keyboard navigation is great!
> 
> Question: for TOC navigation, should the navigation using tab/shift-tab be documented as well? Or maybe mentioning the fact you need to first focus on the input field for it to work.

I improved the help section based on @nizarbenalla's feedback, also making list items shorter and more uniform. This is how it looks now:

![grafik](https://github.com/user-attachments/assets/c3b10440-87b3-4f46-8cf1-61a62001069b)

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PR Comment: https://git.openjdk.org/jdk/pull/23777#issuecomment-2705814231