Join-Path help topic is missing the new -AdditionalChildPath parameter

[mklement0]

Using reflection with Get-Command -Syntax, v6 now shows a new parameter named AdditionalChildPath:

Join-Path [-Path] <string[]> [-ChildPath] <string> [[-AdditionalChildPath] <string[]>] [-Resolve] [-Credential <pscredential>] [<CommonParameters>]

This new parameter has the ValueFromRemainingArguments property, which enables joining an indefinite number of path components like so:

> Join-Path a b c d
a/b/c/d

This parameter is not currently documented in https://github.com/PowerShell/PowerShell-Docs/blob/staging/reference/6/Microsoft.PowerShell.Management/Join-Path.md

Version(s) of document impacted

• Impacts 6 document

Reason(s) for not selecting all version of documents

• The documented feature was introduced in selected version of PowerShell

[sdwheeler]

Closed by #2623