DOC: fix tables markup in demo database chapter

Author: Liudmila Mantrova

doc/src/sgml/demodb-bookings.sgml

@@ -936,13 +936,17 @@ WHERE    a.city IN (
 ORDER BY a.city, a.airport_code;
     </programlisting>
     <screen>
- code |            airport_name            |   city    |             coordinates             |   timezone    
-------+------------------------------------+-----------+-------------------------------------+---------------
- DME  | Domodedovo International Airport   | Moscow    | (37.9062995910645,55.4087982177734) | Europe/Moscow
- SVO  | Sheremetyevo International Airport | Moscow    | (37.4146,55.972599)                 | Europe/Moscow
- VKO  | Vnukovo International Airport      | Moscow    | (37.2615013123,55.5914993286)       | Europe/Moscow
- ULV  | Ulyanovsk Baratayevka Airport      | Ulyanovsk | (48.2266998291,54.2682991028)       | Europe/Samara
- ULY  | Ulyanovsk East Airport             | Ulyanovsk | (48.8027000427246,54.4010009765625) | Europe/Samara
+ code |      airport_name      |   city    |             coordinates             |   timezone
+------+------------------------------------+-----------+-------------------------------------+---
+ DME  | Domodedovo             | Moscow    | (37.9062995910645,55.4087982177734) | Europe/Moscow
+      | International Airport  |           |                                     |
+ SVO  | Sheremetyevo           | Moscow    | (37.4146,55.972599)                 | Europe/Moscow
+      | International Airport  |           |                                     |
+ VKO  | Vnukovo                | Moscow    | (37.2615013123,55.5914993286)       | Europe/Moscow
+      | International Airport  |           |                                     |
+ ULV  | Ulyanovsk              | Ulyanovsk | (48.2266998291,54.2682991028)       | Europe/Samara
+      | Baratayevka Airport    |           |                                     |
+ ULY  | Ulyanovsk East Airport | Ulyanovsk | (48.8027000427246,54.4010009765625) | Europe/Samara
 (5 rows)
     </screen>
    </para>
@@ -955,22 +959,22 @@ ORDER BY a.city, a.airport_code;
 
     <programlisting>
 SELECT r.arrival_city as city,
-       r.arrival_airport as airport_code,
+       r.arrival_airport as code,
        r.arrival_airport_name as airport_name,
        r.days_of_week,
        r.duration
 FROM   routes r
 WHERE  r.departure_city = 'Volgograd';
     </programlisting>
     <screen>
-    city     | airport_code |            airport_name            |  days_of_week   | duration 
--------------+--------------+------------------------------------+-----------------+----------
- Moscow      | SVO          | Sheremetyevo International Airport | {1,2,3,4,5,6,7} | 01:15:00
- Chelyabinsk | CEK          | Chelyabinsk Balandino Airport      | {1,2,3,4,5,6,7} | 01:50:00
- Rostov      | ROV          | Rostov-on-Don Airport              | {1,2,3,4,5,6,7} | 00:30:00
- Moscow      | VKO          | Vnukovo International Airport      | {1,2,3,4,5,6,7} | 01:10:00
- Cheboksary  | CSY          | Cheboksary Airport                 | {1,2,3,4,5,6,7} | 02:45:00
- Tomsk       | TOF          | Bogashevo Airport                  | {1}             | 03:50:00
+    city     | code |            airport_name            |  days_of_week   | duration 
+-------------+------+------------------------------------+-----------------+----------
+ Moscow      | SVO  | Sheremetyevo International Airport | {1,2,3,4,5,6,7} | 01:15:00
+ Chelyabinsk | CEK  | Chelyabinsk Balandino Airport      | {1,2,3,4,5,6,7} | 01:50:00
+ Rostov      | ROV  | Rostov-on-Don Airport              | {1,2,3,4,5,6,7} | 00:30:00
+ Moscow      | VKO  | Vnukovo International Airport      | {1,2,3,4,5,6,7} | 01:10:00
+ Cheboksary  | CSY  | Cheboksary Airport                 | {1,2,3,4,5,6,7} | 02:45:00
+ Tomsk       | TOF  | Bogashevo Airport                  | {1}             | 03:50:00
 (6 rows)
     </screen>
    </para>