I have not implemented displaying formatted environment information with 
--list. Currently --list --format [format] simply displays the list of 
available environments. I've added examples for --list and -l. I've also 
removed the -e example, which no longer exists.

> In cmd/juju/switch.go:
>
> > @@ -77,7 +139,6 @@ func (c *SwitchCommand) Run(ctx *cmd.Context) error {
> >  	sort.Strings(names)
> >
> >  	if c.List {
> > -		// List all environments.
>
> You don't have any examples for list with format output.
>
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> <https://github.com/juju/juju/pull/20/files#r13420070>.
>