updating support matrix

Author: SummerSmith

azure-stack/user/kubernetes-aks-engine-release-notes.md

@@ -93,7 +93,7 @@ For AKS Engine release v0.75.3, clusters with Windows nodes on Kubernetes v1.23
 | 2108                                           | 0.63.0, 0.67.0, 0.67.3, 0.70.0, 0.71.0, 0.73.0, 0.75.3, 0.76.0 |
 | 2206                                           | 0.70.0, 0.71.0, 0.73.0, 0.75.3, 0.76.0, 0.77.0 |
 | 2301                                           | 0.75.3, 0.76.0, 0.77.0, 0.78.0, 0.79.0 |
-| 2306                                           | 0.78.0, 0.79.0*, 0.80.2* |
+| 2306                                           | 0.78.0, 0.79.0, 0.80.2 |
 | 2311                                           | 0.80.2* |
 | 2406                                           | 0.80.2*, 0.81.0* |
 | 2408                                           | 0.80.2*, 0.81.0* |