Update hbase-website/app/pages/_docs/docs/_mdx/(multi-page)/architecture/regionserver.mdx

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: liuxiaocs7

hbase-website/app/pages/_docs/docs/_mdx/(multi-page)/architecture/regionserver.mdx

@@ -431,10 +431,11 @@ Although splitting the region is a local decision made by the RegionServer, the
 ### Note on split directory behavior (HBASE-26187)
 
 <Callout type="info" title="Behavior change in newer split implementation">
-  The numbered split procedure above contains legacy wording that mentions a `.splits` sub-directory under the parent region directory.
-  In newer implementations, [HBASE-26187](https://issues.apache.org/jira/browse/HBASE-26187) changed this behavior:
+  The numbered split procedure above documents the original, pre-HBASE-26187 implementation, in which daughter regions are first created under a `.splits` sub-directory of the parent region directory.
+  In newer HBase implementations that include [HBASE-26187](https://issues.apache.org/jira/browse/HBASE-26187), this on-disk layout has changed:
   daughter region directories are created directly under the table directory, rather than under a parent-region `.splits` directory.
-  This update does not change the high-level split semantics (references, meta updates, and online transition of daughters), but it changes where temporary/initial daughter files are prepared in HDFS.
+  When reading the numbered procedure for such newer versions, interpret any steps that mention creating or using a `.splits` directory as instead preparing and promoting daughter region files directly under the table directory.
+  This update does not change the high-level split semantics (references, meta updates, and online transition of daughters); it only affects where temporary/initial daughter files are prepared in HDFS.
 </Callout>
 
 ## Write Ahead Log (WAL)