A help topic for a nonexistent cmdlet

[alexandair]

https://github.com/PowerShell/PowerShell-Docs/blob/live/reference/6/Microsoft.PowerShell.Core/Get-HashValueFromString.md

Cmdlet Get-HashValueFromString doesn't exist.

[juanpablojofre]

Also, removing 'Get-OSVersion'; that doesn't exist either.

[alexandair]

Closing the issue. PR #1580 contains a fix.