feat(k8s): add mutualized control plane to table

Author: bene2k1

pages/kubernetes/reference-content/understanding-differences-kapsule-kosmos.mdx

@@ -44,7 +44,10 @@ Kosmos is Scaleway's **multi-cloud Kubernetes solution**, designed to operate ac
 | Auto healing                        | ✔️                                                          | Scaleway Instances only                                                                                     |
 | Auto scaling                        | ✔️                                                          | Scaleway Instances only                                                                                     |
 | Container Storage Interface         | ✔️ Persistent volumes (Block Storage) on Scaleway Instances | Scaleway Instances only                                                                                     |
+| Free mutualized basic control plane | ✔️                                                          | ✔️                                                                                                           |
 | Dedicated control plane options     | ✔️                                                          | ✔️                                                                                                           |
 | Scaleway VPC                        | ✔️ Controlled isolation or full isolation                   | ✘ No integration                                                                                            |
 | Scaleway Cockpit                    | ✔️                                                          | ✔️                                                                                                           |
-| Node pools upgrades                 | Handled by Kapsule                                          | *Internal pools*: Handled by Kapsule<br />*External pools*: Must be carried out manually per node                                                                       |
+| Node pools upgrades                 | Handled by Kapsule                                          | *Internal pools*: Handled by Kapsule<br />*External pools*: Must be carried out manually per node                                                                       |
+
+AZ = [Availability Zone](/account/reference-content/products-availability/)