azurerm_linux_virtual_machine_scale_set - add description for non-computed scale_in property to 4.0 upgrade doc

[ms-zhenhua]

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Description

Fix #27387
azurerm_linux_virtual_machine_scale_set.scale_in changed from computed to non-computed after upgrading to 4.0, which is by design. Need to add this change to 4.0 upgrade doc.

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Change Log

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• azurerm_linux_virtual_machine_scale_set - add description for non-computed scale_in property to 4.0 upgrade doc [Plan drift in azurerm_linux_virtual_machine_scale_set #27387]

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #27387

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[stephybun]

Thanks @ms-zhenhua LGTM 🐞