While checking something, I noticed that opfamilies 3626, 3683, 3901
(all btree AM), 3903 (hash) and 3919 (gist) are all defined in the
section marked as "gin".
(I'm not sure if it helps to deliver a patch - it may be easier for the
committer to move the items himself than to check if the diff is correct)
// Antonin Houska (Tony)