Merge pull request #288930 from grover2754/Metadatacache_regionupdates2

New RTS regions2

Author: prmerger-automator[bot]

articles/storage/files/smb-performance.md

@@ -227,7 +227,7 @@ Currently the metadata caching preview is only available in the following Azure
 - Switzerland North
 - UAE North
 - UK West
-- UK South Central
+- US South Central
 - US West Central
 - US West 3