Add Jdk17-Jdk21 as pre-generated doc

[clementbera]

Could you guys please add as pregenerated docs the diff between all LTS versions, including the diff between JDK17 and 21? 8 to 11 and 11 to 17 are already there. Alternatively can AdoptOpenJDK provide a separate website with these diffs? I tried to generate them but it cannot work in my work set-up.

Thanks for the amazing work you guys did there.