ommitted "not"

From context and general understanding, it looks like this was intended to be "most Kubernetes users will *not* need to
install extensions and fewer will need to author new ones."

Author: devriesb

content/en/docs/concepts/extend-kubernetes/extend-cluster.md

@@ -50,7 +50,7 @@ Extensions are software components that extend and deeply integrate with Kuberne
 They adapt it to support new types and new kinds of hardware.
 
 Most cluster administrators will use a hosted or distribution
-instance of Kubernetes. As a result, most Kubernetes users will need to
+instance of Kubernetes. As a result, most Kubernetes users will not need to
 install extensions and fewer will need to author new ones.
 
 ## Extension Patterns