(AzureCXP) remove preview note

Author: PramodValavala-MSFT

articles/azure-functions/functions-reference-powershell.md

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 This article provides details about how you write Azure Functions using PowerShell.
 
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 A PowerShell Azure function (function) is represented as a PowerShell script that executes when triggered. Each function script has a related `function.json` file that defines how the function behaves, such as how it's triggered and its input and output parameters. To learn more, see the [Triggers and binding article](functions-triggers-bindings.md). 
 
 Like other kinds of functions, PowerShell script functions take in parameters that match the names of all the input bindings defined in the `function.json` file. A `TriggerMetadata` parameter is also passed that contains additional information on the trigger that started the function.