Update best-practices-on-public-cloud.md (#19361)

best-practices-on-public-cloud.md

@@ -193,14 +193,14 @@ set global tidb_tso_client_batch_max_wait_time = 2; # default: 0
 
 #### Adjust TiKV configuration
 
-To reduce the number of Regions and alleviate the heartbeat overhead on the system, it is recommended to increase the Region size in the TiKV configuration from `96MB` to `256MB`.
+To reduce the number of Regions and alleviate the heartbeat overhead on the system, you can refer to [Adjust Region size](/best-practices/massive-regions-best-practices.md#method-6-adjust-region-size) to moderately increase the size of the Region in TiKV configuration.
 
 ```
 [coprocessor]
-  region-split-size = "256MB"
+  region-split-size = "288MiB"
 ```
 
-## After tuning
+### After tuning
 
 After the tuning, the following effects can be observed: