Support Java Markdown Doc Comments (JEP 467, JDK 23)

[odenix]

Is your feature request related to a problem? Please describe
I have a mixed Java/Kotlin project and use Dokka to generate its documentation.
Recently I refactored all Javadoc to use Markdown Doc Comments (JEP 467, JDK 23).
It's a big improvement, but Dokka doesn't recognize it.

Describe the solution you'd like
I'd like Dokka to support Markdown Doc Comments (///) in addition to the regular Javadoc syntax (/** */).

Describe alternatives you've considered
Generate Java documentation with javadoc, and Kotlin documentation with Dokka.
This is my current workaround, but it’s not pretty, and not in the Dokka spirit.