Fixed indentation and removed cacert as we are not showing the cert anymore.

> In cmd/juju/switch.go:
>
> > +# Show current environment name
> > +$ juju switch
> > +local
> > +
> > +# Switch to the ec2 environment. Show the environment you are switching
> > +# from and to i.e. "oldEnv -> newEnv"
> > +$ juju switch ec2
> > +local -> ec2
> > +
> > +# Show username, API endpoints and environment name
> > +$ juju switch --format yaml
> > +environ-name: local
> > +state-servers:
> > +		- example.com
> > +		- kremvax.ru
> > +		cacert: cert
>
> The indentation of this example is almost certainly wrong.
>
> Also, I don't think we should be showing state-servers and cacert by 
> default. environ-name and username sure, but state-servers and cacert 
> I don't think we should be showing all the time.
>
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> <https://github.com/juju/juju/pull/20/files#r13420001>.
>