Documentation: fix typo in example for editing machine metadata
Documentation: fix typo in example for editing machine metadata

PATCH method should run with a prefix "/fleet/v1/".

coreos/fleet,giantswarm/fleet,coreos/fleet,dongsupark/fleet,dongsupark/fleet,giantswarm/fleet,endocode/fleet,endocode/fleet,jonboulle/fleet,dongsupark/fleet,giantswarm/fleet,jonboulle/fleet,coreos/fleet,jonboulle/fleet,endocode/fleet