📖 Update README for a more up-to-date view

Signed-off-by: Vince Prignano <vincepri@vmware.com>

README.md

@@ -21,14 +21,9 @@ Cluster API is a Kubernetes sub-project focused on providing declarative APIs an
 
 Started by the Kubernetes Special Interest Group (SIG) Cluster Lifecycle, the Cluster API project uses Kubernetes-style APIs and patterns to automate cluster lifecycle management for platform operators. The supporting infrastructure, like virtual machines, networks, load balancers, and VPCs, as well as the Kubernetes cluster configuration are all defined in the same way that application developers operate deploying and managing their workloads. This enables consistent and repeatable cluster deployments across a wide variety of infrastructure environments.
 
-__NB__: Cluster API is still in a prototype stage while we get
-feedback on the API types themselves. All of the code here is to experiment with
-the API and demo its abilities, in order to drive more technical feedback to the
-API design. Because of this, all of the codebase is rapidly changing.
-
 ### ⚙️ Providers
 
-Cluster API can be extended to support any infrastructure provider (AWS, Azure, vSphere, etc.) or bootstrap provider (kubeadm is default) you need. There is a growing list of [supported providers](https://cluster-api.sigs.k8s.io/reference/providers.html) available.
+Cluster API can be extended to support any infrastructure (AWS, Azure, vSphere, etc.), bootstrap or control plane (kubeadm is built-in) provider. There is a growing list of [supported providers](https://cluster-api.sigs.k8s.io/reference/providers.html) available.
 
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