Add instructions on performing node rollouts when trying to do kernel updates

Add documentation when a node rollout is required, for example a CVE situation for the OS image. This can be as simple as just reiterating the upgrade documentation when this situation happens, but just a clear callout for users to reference instead of inferencing it from the upgrade documentation.

Start by locating the existing upgrade documentation and its guidance for node rollouts. Add a clear callout explaining that a node rollout is required for kernel or OS image updates, such as a CVE response, and point users to the relevant upgrade instructions.

Written by the indexing model from the issue text.