Update Azure Functions PowerShell developer guide to include the required network endpoints for PowerShellGet

We need to update the [Azure Functions PowerShell developer guide for Managed Dependencies](https://learn.microsoft.com/en-us/azure/azure-functions/functions-reference-powershell?tabs=portal#dependency-management) to include the [required network endpoints](https://learn.microsoft.com/en-us/powershell/scripting/gallery/how-to/getting-support/troubleshooting-cmdlets?view=powershell-7.3#required-network-endpoints) for PowerShellGet to install modules from the PowerShell Gallery.