Clean PodPreset docs, examples and links

Author: tengqm

content/en/docs/concepts/configuration/secret.md

@@ -795,7 +795,6 @@ See [Add ImagePullSecrets to a service account](/docs/tasks/configure-pod-contai
 
 Manually created secrets (for example, one containing a token for accessing a GitHub account)
 can be automatically attached to pods based on their service account.
-See [Injecting Information into Pods Using a PodPreset](/docs/tasks/inject-data-application/podpreset/) for a detailed explanation of that process.
 
 ## Details
 

content/en/docs/reference/access-authn-authz/admission-controllers.md

@@ -669,13 +669,6 @@ allowVolumeExpansion: true
 
 For more information about persistent volume claims, see [PersistentVolumeClaims](/docs/concepts/storage/persistent-volumes/#persistentvolumeclaims).
 
-### PodPreset {#podpreset}
-
-This admission controller injects a pod with the fields specified in a matching PodPreset.
-See also [PodPreset concept](/docs/concepts/workloads/pods/podpreset/) and
-[Inject Information into Pods Using a PodPreset](/docs/tasks/inject-data-application/podpreset)
-for more information.
-
 ### PodSecurityPolicy {#podsecuritypolicy}
 
 This admission controller acts on creation and modification of the pod and determines if it should be admitted