DB: Fixed a comment

db.ddl

@@ -54,7 +54,7 @@ CREATE TABLE owl_topics (
 					-- 'H' = heading
 					-- 'T' = task
 					-- 'D' = discussion
-					-- 'X' = task with awarding of extra points
+					-- 'A' = task with awarding of extra points
 	max_points	numeric(6,2)	DEFAULT NULL,
 	UNIQUE(cid, ident)
 );