docs: update cli reference

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

docs/content/reference/d2vm_run_hetzner.md

@@ -0,0 +1,29 @@
+## d2vm run hetzner
+
+Run the virtual machine image on Hetzner Cloud
+
+```
+d2vm run hetzner [options] image-path [flags]
+```
+
+### Options
+
+```
+  -h, --help             help for hetzner
+  -n, --name string      d2vm server name (default "d2vm")
+      --rm               remove server when done
+  -i, --ssh-key string   d2vm image identity key
+  -t, --token string     Hetzner Cloud API token [$HETZNER_TOKEN]
+  -u, --user string      d2vm image ssh user (default "root")
+```
+
+### Options inherited from parent commands
+
+```
+  -v, --verbose   Enable Verbose output
+```
+
+### SEE ALSO
+
+* [d2vm run](d2vm_run.md)	 - Run the virtual machine image
+