Fix example plan in optimizer/README.
Joining three tables only takes two join nodes. I think when I (tgl)
wrote this, I was envisioning possible additional joins; but since the
example doesn't show any fourth table, it's just confusing to write
a third join node.
Etsuro Fujita
Discussion: https://postgr.es/m/
e6cfbaa3-af02-1abc-c25e-
8fa5c6bc4e21@lab.ntt.co.jp