Enhance javadoc generation for specific Java project

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You can provide a custom doclet

configurations {
   mydoclet
}
dependencies {
   mydoclet project(':mydoclet')
}
javadoc {
   options.docletpath = configurations.mydoclet.files.asType(List)
   options.doclet = 'com.foo.MyDoclet'
}

https://docs.gradle.org/current/dsl/org.gradle.api.tasks.javadoc.Javadoc.html
http://docs.oracle.com/javase/7/docs/technotes/guides/javadoc/doclet/overview.html