Incorrect redirect_url in .openpublishing.redirection.json

`https://docs.microsoft.com/powershell/scripting/components/vscode/using-vscode -> 301`
`https://docs.microsoft.com/powershell/scripting/reference/docs-conceptual/dev-cross-plat/vscode/using-vscode -> 404`

related issue: https://github.com/PowerShell/PowerShell/issues/12775