[core] Add notes for status.interval and basicdb.ranomizedelay options.
[core] Add notes for status.interval and basicdb.ranomizedelay options.

madhurihn/YCSB_ToyDB,madhurihn/YCSB_ToyDB,jaemyoun/YCSB,jaemyoun/YCSB,leschekhomann/YCSB,madhurihn/YCSB_ToyDB,brianfrankcooper/YCSB,jaemyoun/YCSB,cricket007/YCSB,zyguan/ycsb,ChristianNavolskyi/YCSB,manolama/YCSB,leschekhomann/YCSB,leschekhomann/YCSB,cricket007/YCSB,zyguan/ycsb,brianfrankcooper/YCSB,manolama/YCSB,ChristianNavolskyi/YCSB,manolama/YCSB,leschekhomann/YCSB,ChristianNavolskyi/YCSB,brianfrankcooper/YCSB,cricket007/YCSB,zyguan/ycsb,brianfrankcooper/YCSB,ChristianNavolskyi/YCSB,jaemyoun/YCSB,madhurihn/YCSB_ToyDB,manolama/YCSB,cricket007/YCSB,zyguan/ycsb