RFR: 8348282: Add option for syntax highlighting in javadoc snippets [v4]

[Chen Liang]

On Wed, 9 Apr 2025 04:15:20 GMT, Hannes Wallnöfer <hannesw at openjdk.org> wrote:

>> Please review a change to add a `javadoc` option to enable syntax highlighting for code fragments in snippets and  `<pre><code>` tags. The new `--syntax-highlight` option uses the [highlight.js] JavaScript library and supports Java, Properties, XML, HTML and JSON. The option is enabled in the JDK API docs target, [generated output is available here](https://cr.openjdk.org/~hannesw/8348282/api.00/index.html).
>
> Hannes Wallnöfer has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Adjust color palette

We don't have enough reviewer in Javadoc area; @nizarbenalla please consider reviewing this.

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PR Comment: https://git.openjdk.org/jdk/pull/24417#issuecomment-2824856540