Remove Docker mentions

content/en/docs/concepts/cluster-administration/system-logs.md

@@ -182,7 +182,8 @@ There are two types of system components: those that run in a container and thos
 that do not run in a container. For example:
 
 * The Kubernetes scheduler and kube-proxy run in a container.
-* The kubelet and container runtime, for example Docker, do not run in containers.
+* The kubelet and {{<glossary_tooltip term_id="container-runtime" text="container runtime">}}
+  do not run in containers.
 
 On machines with systemd, the kubelet and container runtime write to journald.
 Otherwise, they write to `.log` files in the `/var/log` directory.

content/en/docs/reference/glossary/container-runtime.md

@@ -15,7 +15,7 @@ tags:
 
 <!--more-->
 
-Kubernetes supports several container runtimes: {{< glossary_tooltip term_id="docker">}},
+Kubernetes supports container runtimes such as
 {{< glossary_tooltip term_id="containerd" >}}, {{< glossary_tooltip term_id="cri-o" >}},
 and any implementation of the [Kubernetes CRI (Container Runtime
 Interface)](https://github.com/kubernetes/community/blob/master/contributors/devel/sig-node/container-runtime-interface.md).