Use forward link to point to task doc

src/vs/workbench/parts/tasks/common/taskSampleConfig.json

 {
-	// See http://code.visualstudio.com/docs/editor/tasks
+	// See http://go.microsoft.com/fwlink/?LinkId=733558
 	// for the documentation about the tasks.json format
 	// Use IntelliSense to insert predefined task snippets
 	ts