(GH-8618) Add note to Measure-Object in 7.3 (#8638)

* (GH-8618) Add note to Measure-Object in 7.3

This commit adds a note to the `Measure-Object` cmdlet reference
documentation for PowerShell 7.3 to clarify that it now only returns
an argument error when an object is missing the to-measure property
in **StrictMode** to pair with the updated implementation from
PowerShell/PowerShell#16589.

* Address review feedback.

Co-authored-by: Sean Wheeler <sean.wheeler@microsoft.com>

Co-authored-by: Sean Wheeler <sean.wheeler@microsoft.com>

reference/7.3/Microsoft.PowerShell.Utility/Measure-Object.md

@@ -2,7 +2,7 @@
 external help file: Microsoft.PowerShell.Commands.Utility.dll-Help.xml
 Locale: en-US
 Module Name: Microsoft.PowerShell.Utility
-ms.date: 07/15/2021
+ms.date: 03/08/2022
 online version: https://docs.microsoft.com/powershell/module/microsoft.powershell.utility/measure-object?view=powershell-7.3&WT.mc_id=ps-gethelp
 schema: 2.0.0
 title: Measure-Object
@@ -546,6 +546,12 @@ Otherwise, it returns a **GenericMeasureInfo** object.
 
 ## NOTES
 
+Starting in PowerShell 7.3, `Measure-Object` no longer returns an error when
+processing an object that is missing the property being measured unless you are
+running in **StrictMode**. In **StrictMode**, `Measure-Object` returns a
+`System.Management.Automation.PSArgumentException` when processing an object
+that is missing the specified property.
+
 ## RELATED LINKS
 
 [about_Calculated_Properties](../Microsoft.PowerShell.Core/About/about_Calculated_Properties.md)