docs: Change values.yaml wording to reference correct resource
docs: Change values.yaml wording to reference correct resource

Signed-off-by: Peter Fiddes <fdff0a5ba664576c63e301cd205f6be5e90b8cc4@gmail.com>

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