rebase certificates PR on Hugo master (#9842)

* rebase certificates PR on Hugo master

Co-authored-by: liztio <liz@heptio.com>

* fix per comments, add note about front-proxy

* fix up key usage table and references

content/en/docs/setup/independent/kubelet-integration.md

@@ -20,7 +20,7 @@ system or service manager. When the kubelet is installed using DEBs or RPMs,
 systemd is configured to manage the kubelet. You can use a different service
 manager instead, but you need to configure it manually.
 
-Some kublet configuration details need to be the same across all kubelets involved in the cluster, while
+Some kubelet configuration details need to be the same across all kubelets involved in the cluster, while
 other configuration aspects need to be set on a per-kubelet basis, to accommodate the different
 characteristics of a given machine, such as OS, storage, and networking. You can manage the configuration
 of your kubelets manually, but [kubeadm now provides a `MasterConfig` API type for managing your
@@ -28,8 +28,6 @@ kubelet configurations centrally](#configure-kubelets-using-kubeadm).
 
 {{% /capture %}}
 
-{{ toc }}
-
 {{% capture body %}}
 
 ## Kubelet configuration patterns
@@ -98,8 +96,6 @@ such as systemd.
 
 ## Configure kubelets using kubeadm
 
-{{ feature-state for_k8s_version="1.11" state="stable" }}
-
 The kubeadm config API type `MasterConfiguration` embeds the kubelet's ComponentConfig under
 the `.kubeletConfiguration.baseConfig` key. Any user writing a `MasterConfiguration`
 file can use this configuration key to also set the base-level configuration for all kubelets