Clarify guidelines on plural parameter names

[isra-fel]

Added exception for plural parameter names regarding units.

Description

Clarify guidelines on plural parameter names

Mandatory Checklist

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Pull Request Overview

This PR clarifies the Azure PowerShell design guidelines regarding plural parameter names by adding an exception for units. The change addresses a common scenario where parameter names naturally use plural forms when indicating units of measurement.

• Adds clarification that units are an exception to the plural parameter naming guideline