Update wsl2-mount-disk.md

Author: craigloewen-msft

WSL/wsl2-mount-disk.md

@@ -170,7 +170,7 @@ If `Diskpath` is omitted, all attached disks are unmounted and detached.
 You can also mount virtual hard disk files (VHD) into WSL using `wsl --mount`. To do this, you first need to mount the VHD into Windows using the [`Mount-VHD`](https://docs.microsoft.com/powershell/module/hyper-v/mount-vhd) command in Windows. Be sure to run this command in a window with administrator privileges. Below is an example where we use this command, and also output the disk path 
 
 ```powershell
-Write-Output "\.\\PhysicalDrive$((Mount-VHD -Path .\ext4.vhdx -PassThru | Get-Disk).Number)"
+Write-Output "\\.\PhysicalDrive$((Mount-VHD -Path .\ext4.vhdx -PassThru | Get-Disk).Number)"
 ```
 
 You can use the output above to obtain the disk path for this VHD and mount that into WSL following the instructions in the previous section.