doc:  adjust "cities" example to be consistent with other SQL
Reported-by:
Discussion:
Backpatch-through: 9.6
<programlisting>
CREATE VIEW myview AS
- SELECT city, temp_lo, temp_hi, prcp, date, location
+ SELECT name, temp_lo, temp_hi, prcp, date, location
FROM weather, cities
WHERE city = name;
@@ -101,12 +101,12 @@ SELECT * FROM myview;
<programlisting>
CREATE TABLE cities (
- city varchar(80) primary key,
+ name varchar(80) primary key,
location point
);
CREATE TABLE weather (
- city varchar(80) references cities(city),
+ city varchar(80) references cities(name),
temp_lo int,
temp_hi int,
prcp real,
