config kNumLevels for TEST LastLevelCompaction

test/ttl_test.cc

@@ -104,9 +104,7 @@ TEST(TestTTL, CompactionTTL) {
     delete db;
 }
 
-// Time-consuming when kNumLevels is 7, so run this test when kNumLevels is set to 3,
-// the codes on branch light_ver
-// In this case level 2 is the last level with files
+// Test handling last level with kNumLevels = 3
 TEST(TestTTL, LastLevelCompaction) {
   DB *db;