Update parameter-files.md

MicrosoftDocs/azure-docs#118592

Author: MonikaReddy-MSFT

articles/azure-resource-manager/bicep/parameter-files.md

@@ -33,7 +33,7 @@ param <second-parameter-name> = <second-value>
 You can use expressions with the default value. For example:
 
 ```bicep
-using 'storageaccount.bicep'
+using 'main.bicep'
 
 param storageName = toLower('MyStorageAccount')
 param intValue = 2 + 2