RFR: JDK-8287674: CSS improvements for summary lists [v4]

[Hannes Wallnöfer]

On Tue, 7 Jun 2022 06:21:59 GMT, Hannes Wallnöfer <hannesw at openjdk.org> wrote:

>> This is a refinement of CSS styles mostly in the deprecated and new API pages.
>> 
>>  - Provide a two-row table view for the new sortable three-column tables
>>  - Make sure no line wraps are inserted between a checkbox and its label
>>  - Slightly increase the line height of the check box row to make it easier to use when wrapped
>>  - Define the overflow of summary table cells as "auto" which makes them scrollable if necessary
>
> Hannes Wallnöfer has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Remove unused imports
>  - Use normal space instead of <wbr> as the latter is not rendered as space by Chrome

I have replaced the `<wbr>` elements between checkboxes with plain space characters as the former reduces the spacing between checkboxes on Chrome. With plain space characters, spacing is the same as before on all tested browsers and line wrapping works as expected.

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PR: https://git.openjdk.java.net/jdk/pull/8975