doc: clarify "state" table reference in tutorial

Bruce Momjian <bruce@momjian.us>

Commit: 1ed7b43319efa27181a9ccda66f80b7e76ba8fa3
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-08-05T21:12:10Z
Releases: 10.14
doc:  clarify "state" table reference in tutorial

Reported-by: Vyacheslav Shablistyy

Discussion: https://postgr.es/m/159586122762.680.1361378513036616007@wrigleys.postgresql.org

Backpatch-through: 9.5

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doc/src/sgml/advanced.sgml modified +3 −2

Documentation touched