Change wording in tournament instructions (#2135)

Author: kytrinyx

exercises/tournament/description.md

@@ -24,7 +24,7 @@ A win earns a team 3 points.
 A draw earns 1.
 A loss earns 0.
 
-The outcome should be ordered by points, descending.
+The outcome is ordered by points, descending.
 In case of a tie, teams are ordered alphabetically.
 
 ## Input