Add some notes about why "ALTER TYPE enum DROP VALUE" is hard.
In hopes of putting these where any would-be implementer is sure to
find them, make a placeholder grammar production for ALTER DROP VALUE
and put them there. This is really just a docs patch, though.
Vik Fearing, with a bit more wordsmithing by me
Discussion: https://postgr.es/m/
9fffd149-da0f-0c9c-6745-
731fb688642a@postgresfriends.org