doc: clarify "state" table reference in tutorial

Bruce Momjian <bruce@momjian.us>

Commit: 74e1c967b533a334e61a2b343e2b6444067f6173
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-08-05T21:12:09Z
Releases: 9.5.23
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