Include Pod OS field

Include Pod OS field in the pod concepts.

content/en/docs/concepts/workloads/pods/_index.md

@@ -138,6 +138,23 @@ it is deleted.
 When you create the manifest for a Pod object, make sure the name specified is a valid
 [DNS subdomain name](/docs/concepts/overview/working-with-objects/names#dns-subdomain-names).
 
+### Pod OS
+
+{{< feature-state state="stable" for_k8s_version="v1.25" >}}
+
+You should set the `.spec.os.name` field to either `windows` or `linux` to indicate the OS on
+which you want the pod to run. These two are the only operating systems supported for now by 
+Kubernetes. In future, this list may be expanded.
+
+In Kubernetes v{{ skew currentVersion}}, the value you set for this field has no
+effect on {{< glossary_tooltip text="scheduling" term_id="kube-scheduler" >}} of the pods.
+Setting the `.spec.os.name` helps to identify the pod OS
+authoratitively and is used for validation. The kubelet refuses to run a Pod where you have
+specified a Pod OS, if this isn't the same as the operating system for the node where
+that kubelet is running.
+The [Pod security standards](/docs/concepts/security/pod-security-standards/) also use this
+field to avoid enforcing policies that aren't relevant to that operating system.
+
 ### Pods and controllers
 
 You can use workload resources to create and manage multiple Pods for you. A controller