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

Reported-by: [email protected]

Discussion: 
https://postgr.es/m/[email protected]

Backpatch-through: 9.6

Branch
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REL_13_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/650e6359018a54287d99fcd9640fb24fa7209467

Modified Files
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doc/src/sgml/advanced.sgml | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

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