RFR: 7903257: jextract should generate javadoc comments [v2]

[Per Minborg]

On Wed, 12 Oct 2022 11:58:33 GMT, Athijegannathan Sundararajan <sundar at openjdk.org> wrote:

>> Generating C signature as doc comments.
>
> Athijegannathan Sundararajan has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fixed comment generation COMPLEX type. using correct libffmpeg version.

Marked as reviewed by minborg at github.com (no known OpenJDK username).

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PR: https://git.openjdk.org/jextract/pull/85