[docs] Fix title of foreign key section in Editor
@@ -182,7 +182,7 @@ Here is an example of SQL for using them:
TBLPROPERTIES ('kudu.num_tablet_replicas' = '1')
;
-## Foreign Keys
+#### Foreign Keys
When a column value points to another column in another table. e.g. The head of the business unit must exist in the person table:
