doc: adjust "cities" example to be consistent with other SQL

Bruce Momjian <bruce@momjian.us>

Commit: 58f759fd030a2c2b067107140474eaf59c8f168a
Author: Bruce Momjian <bruce@momjian.us>
Date: 2021-07-03T00:42:45Z
Releases: 9.6.23
doc:  adjust "cities" example to be consistent with other SQL

Reported-by: tom@crystae.net

Discussion: https://postgr.es/m/162345756191.14472.9754568432103008703@wrigleys.postgresql.org

Backpatch-through: 9.6

Files

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

Documentation touched