tikv: customized Region size is an experimental feature before TiDB v…

…6.5.0 (#19071) (#19088)

best-practices/massive-regions-best-practices.md

@@ -139,13 +139,9 @@ If Region followers have not received the heartbeat from the leader within the `
 
 The default size of a Region is 96 MiB, and you can reduce the number of Regions by setting Regions to a larger size. For more information, see [Tune Region Performance](/tune-region-performance.md).
 
-> **Warning:**
->
-> Currently, customized Region size is an experimental feature introduced in TiDB v6.1.0. It is not recommended that you use it in production environments. The risks are as follows:
+> **Note:**
 >
-> + Performance jitter might be caused.
-> + The query performance, especially for queries that deal with a large range of data, might decrease.
-> + The Region scheduling slows down.
+> Customized Region size is an experimental feature before TiDB v6.5.0. If you need to resize the Region size, it is recommended that you upgrade to v6.5.0 or a later version.
 
 ### Method 7: Increase the maximum number of connections for Raft communication