Update guest-configuration-create.md

Author: mgreenegit

articles/governance/policy/how-to/guest-configuration-create.md

@@ -220,8 +220,10 @@ Configuration AuditBitLocker
 }
 
 # Compile the configuration to create the MOF files
-AuditBitLocker -out ./Config
+AuditBitLocker ./Config
 ```
+Save this file with name `config.ps1` in the project folder. Run it in PowerShell by executing `./config.ps1`
+in the terminal. A new mof file will be created.
 
 The `Node AuditBitlocker` command isn't technically required but it produces a file named
 `AuditBitlocker.mof` rather than the default, `localhost.mof`. Having the .mof file name follow the