Update instructions to reflect new VSCode extension name

Author: nene

README.md

@@ -191,7 +191,7 @@ pick the proper dialect, like:
 format('select [col] from tbl', { language: 'transactsql' });
 ```
 
-Or when using the VSCode extension: Settings -> Prettier-SQL: SQLFlavourOverride.
+Or when using the VSCode extension: Settings -> SQL-Formatter-VSCode: SQLFlavourOverride.
 
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