docs: update cli reference

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

docs/content/reference/d2vm_completion_zsh.md

@@ -0,0 +1,47 @@
+## d2vm completion zsh
+
+Generate the autocompletion script for zsh
+
+### Synopsis
+
+Generate the autocompletion script for the zsh shell.
+
+If shell completion is not already enabled in your environment you will need
+to enable it.  You can execute the following once:
+
+	echo "autoload -U compinit; compinit" >> ~/.zshrc
+
+To load completions for every new session, execute once:
+
+#### Linux:
+
+	d2vm completion zsh > "${fpath[1]}/_d2vm"
+
+#### macOS:
+
+	d2vm completion zsh > /usr/local/share/zsh/site-functions/_d2vm
+
+You will need to start a new shell for this setup to take effect.
+
+
+```
+d2vm completion zsh [flags]
+```
+
+### Options
+
+```
+  -h, --help              help for zsh
+      --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
+