sample containerd: containerd_runtimes is removed (#8301)

(#8213) split containerd_runtimes to containerd_runc_runtime and
containerd_additional_runtimes

inventory/sample/group_vars/all/containerd.yml

@@ -8,11 +8,13 @@
 # containerd_default_runtime: "runc"
 # containerd_snapshotter: "native"
 
-# containerd_runtimes:
-#   - name: runc
-#     type: "io.containerd.runc.v2"
-#     engine: ""
-#     root: ""
+# containerd_runc_runtime:
+#   name: runc
+#   type: "io.containerd.runc.v2"
+#   engine: ""
+#   root: ""
+
+# containerd_additional_runtimes:
 # Example for Kata Containers as additional runtime:
 #   - name: kata
 #     type: "io.containerd.kata.v2"