docs: update cli reference

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>

docs/content/reference/d2vm_run_vbox.md

@@ -0,0 +1,31 @@
+## d2vm run vbox
+
+Run the virtual machine image with Virtualbox
+
+```
+d2vm run vbox [options] image-path [flags]
+```
+
+### Options
+
+```
+      --cpus uint               Number of CPUs (default 1)
+      --disk disk               Disk config, may be repeated. [file=]path[,size=1G][,format=raw] (default [])
+      --gui                     Show the VM GUI
+  -h, --help                    help for vbox
+      --mem uint                Amount of memory in MB (default 1024)
+      --name string             Name of the Virtualbox VM
+      --networking vbnetworks   Network config, may be repeated. [type=](null|nat|bridged|intnet|hostonly|generic|natnetwork[<devicename>])[,[bridge|host]adapter=<interface>] (default [])
+      --vboxmanage string       VBoxManage binary to use (default "VBoxManage")
+```
+
+### Options inherited from parent commands
+
+```
+  -v, --verbose   Enable Verbose output
+```
+
+### SEE ALSO
+
+* [d2vm run](d2vm_run.md)	 - Run the virtual machine image
+