docs: Document requirements for graceful termination feature
docs: Document requirements for graceful termination feature

Signed-off-by: Aditi Ghag <436242e0c0af36e461a395c937165372864a99f9@cilium.io>

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