The docs have been out of the sync with the actual implementation since 2018. Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
docs/historical
To clarify that end users do not need to read these docs, and that these docs do not need to be updated Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>