PG Doc comments form <noreply(at)postgresql(dot)org> writes:
> F.10. dblink is noted at top of version 11 documentation, and F.11. dblink
> on version 10 documentaion. They appear to be reversed.
You're mistaking documentation section numbers for versions. Comparing
https://www.postgresql.org/docs/10/contrib.html
https://www.postgresql.org/docs/11/contrib.html
might clarify it for you.
regards, tom lane