TELCODOCS:1103 - Update note in kataconfig file about label values

This reverts commit b7ad6949d34b123ee0705f8ce099ee3296e33a47.

Author: MirzWeiss

modules/sandboxed-containers-create-kata-config-resource-cli.adoc

@@ -64,8 +64,9 @@ spec:
   logLevel: info
   kataConfigPoolSelector:
     matchLabels:
-      <label_key>: '<label_value>'
+      <label_key>: '<label_value>' <1>
 ----
+<1> Labels in `kataConfigPoolSelector` only support single values; `nodeSelector` syntax is not supported.
 
 . Create the `KataConfig` resource:
 +