ForEach-Object -Parallel cmdlet needs clarification about using variable scope

[PaulHigin]

Documentation Issue

This is related to Issue (PowerShell/PowerShell#11817). Using variables can be used in nested ForEach-Object -Parallel calls, but need to be defined in each scope. This needs to be made clear in the documents (and also about_Concurrency document when it is written).

Waiting on PowerShell/PowerShell#14548

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  Cmdlet reference & about_ topics

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