add r alias to Recurse Parameter on Get-ChildItem

[kilasuit]

PR Summary

Fixes #15995

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Total files changed: 1

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[daxian-dbw]

LGTM

[Liturgist]

Should there be an addition to .\test\powershell\Modules\Microsoft.PowerShell.Management\Get-ChildItem.Tests.ps1 for the added -r alias? Or, are aliases generally not tested?

[iSazonov]

@Liturgist We have generic tests for aliases ("aliases work"). So no need to add tests for every new alias.