Fix SQL query in one of the examples

Author: lnishan

README.md

@@ -59,7 +59,7 @@ select name, description from abseil.repos
 ### → Get last-updated time and title of the issues closed in the past 3 days in [servo](https://github.com/servo) listed in descending order of last-updated time.
 
 ```sql
-select updated_at, title from servo.issues.closed.3 order by updated_at, desc
+select updated_at, title from servo.issues.closed.3 order by updated_at desc
 ```
 
 ![Screenshot2](https://i.imgur.com/nyXdiEh.png)