Update Managed Dependency documentation to mention that the Az module is commented out in the requirments.psd1

Update Managed Dependency documentation (https://learn.microsoft.com/en-us/azure/azure-functions/functions-reference-powershell?tabs=portal#dependency-management) to mention that the `Az` module is commented out in the requirments.psd1. Currently our documentation says that the Az module is included by default.

Here is what the requirements.psd1 file looks like after function app creation:
```powershell
# This file enables modules to be automatically managed by the Functions service.
# See https://aka.ms/functionsmanageddependency for additional information.
#
@{
# For latest supported version, go to 'https://www.powershellgallery.com/packages/Az'.
# To use the Az module in your function app, please uncomment the line below.
# 'Az' = '9.*'
}
```