Add note on PodLevelResources description

Signed-off-by: santosh1176 <[email protected]>

Author: Santosh1176

content/en/docs/concepts/configuration/manage-resources-containers.md

@@ -216,6 +216,8 @@ spec:
 
 {{< feature-state feature_gate_name="PodLevelResources" >}}
 
+This feature can be enabled by setting the `PodLevelResources` [feature
+gate](https://kubernetes.io/docs/reference/command-line-tools-reference/feature-gates/).
 The following Pod has an explicit request of 1 CPU and 100 MiB of memory, and an
 explicit limit of 1 CPU and 200 MiB of memory. The `pod-resources-demo-ctr-1`
 container has explicit requests and limits set. However, the