fix the example queries in adaptive indexing page

Hi Guy,

The example queries Q1/Q2/Q3 should have additional predicate (type = "airport") to match those indexes. Pls fix asap.

 
{{Q1: SELECT * FROM `travel-sample` WHERE airportname LIKE "San Francisco%" AND type = "airport" ; }}
{{Q2: SELECT * FROM `travel-sample` WHERE city = "San Francisco" AND type = "airport" ; }}
Q3: SELECT * FROM `travel-sample` WHERE faa = "SFO" AND type = "airport" ;
 
thanks,
-Prasad