Hello Osumi-san. I have checked the latest v17 patch w.r.t. to my previous comments.
The v17 patch applies cleanly. make check is successful. The regenerated docs look OK. I have no further review comments, so have flagged this v17 as "ready for committer" - https://commitfest.postgresql.org/30/2307/ --- Kind Regards, Peter Smith. Fujitsu Australia