update uninstall description
update uninstall description

Signed-off-by: Joakim Ahrlin <245c4aa8bfe284251de1eb488decaeea36eca31f@gmail.com>

jetstack/cert-manager,cert-manager/cert-manager,jetstack/cert-manager,cert-manager/cert-manager,cert-manager/cert-manager,jetstack/cert-manager