docs: Warn against Helm's `--reuse-values` in Cilium upgrades
docs: Warn against Helm's `--reuse-values` in Cilium upgrades

Using it to upgrade to a new minor Cilium version has never been
supported and may break the Helm template in subtle ways due to the lack
of default values.

Signed-off-by: Sebastian Wicki <db043b2055cb3a47b2eb0b5aebf4e114a8c24a5a@isovalent.com>

cilium/cilium,michi-covalent/cilium,michi-covalent/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium