There are no downloadable JavaDoc builds for the OpenJDK releases. The GitHub actions in this repository are able to build JavaDoc for all OpenJDK releases since OpenJDK 8.
Building OpenJDK basically means installing several prerequisites and kicking off the documentation build. To make it look nicer we add the missing JavaDoc fonts. These steps are performed as GitHub actions.
This repository contains a shared build action in the main branch and release specific configurations individual branches.
Not here. While OpenJDK source is published under the GPL the JavaDoc build adds a link to Oracle's documentation redistribution policy which does not allow re-distribution. You may clone this repository and build the JavaDoc yourself on your own risk.
The scripts are provided "as is" under the MIT License, without warranty of any kind.