Clarify containerd 1.5.0+ for k8s 1.20,1.21
@@ -119,8 +119,8 @@ of containerd for every supported version of Kubernetes.
| Kubernetes Version | containerd Version | CRI Version |
|--------------------|--------------------|--------------|
-| 1.20 | 1.5 | v1alpha2 |
-| 1.21 | 1.5 | v1alpha2 |
+| 1.20 | 1.5.0+ | v1alpha2 |
+| 1.21 | 1.5.0+ | v1alpha2 |
| 1.22 | 1.5.5+ | v1alpha2 |
| 1.23 | 1.6.0+, 1,5.8+ | v1, v1alpha2 |
| 1.24 | 1.6.4+, 1.5.11+ | v1, v1alpha2 |
