Documentation: fix gpg keys in the examples
Documentation: fix gpg keys in the examples

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