docs: update cli reference

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

docs/content/reference/d2vm_completion_powershell.md

@@ -0,0 +1,37 @@
+## d2vm completion powershell
+
+Generate the autocompletion script for powershell
+
+### Synopsis
+
+Generate the autocompletion script for powershell.
+
+To load completions in your current shell session:
+
+	d2vm completion powershell | Out-String | Invoke-Expression
+
+To load completions for every new session, add the output of the above command
+to your powershell profile.
+
+
+```
+d2vm completion powershell [flags]
+```
+
+### Options
+
+```
+  -h, --help              help for powershell
+      --no-descriptions   disable completion descriptions
+```
+
+### Options inherited from parent commands
+
+```
+  -v, --verbose   Enable Verbose output
+```
+
+### SEE ALSO
+
+* [d2vm completion](d2vm_completion.md)	 - Generate the autocompletion script for the specified shell
+