content: hostUsers can't be ignored from 1.30

Now the kubelet asks the runtime for the features it supports and if it
doesn't report user namespaces support, then the kubelet will fail the
pod creation.

Therefore, it is no longer possible for the field to be ignored.

Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>

content/en/docs/tasks/configure-pod-container/user-namespaces.md

@@ -57,10 +57,6 @@ If you have a mixture of nodes and only some of the nodes provide user namespace
 Pods, you also need to ensure that the user namespace Pods are
 [scheduled](/docs/concepts/scheduling-eviction/assign-pod-node/) to suitable nodes.
 
-Please note that **if your container runtime doesn't support user namespaces, the
-`hostUsers` field in the pod spec will be silently ignored and the pod will be
-created without user namespaces.**
-
 <!-- steps -->
 
 ## Run a Pod that uses a user namespace {#create-pod}