Improve Autoscaler overview (#13396)

Improve Autoscaler overview documentation.

website/content/tools/autoscaling/index.mdx

@@ -10,12 +10,17 @@ description: |-
 
 This section details the Nomad Autoscaler, a horizontal application and cluster
 autoscaler for Nomad. The Nomad Autoscaler is built and released separately to
-Nomad. The source code can be viewed on [GitHub][autoscaler_github] and releases
-are available on the [HashiCorp releases page][autoscaler_releases] or via
-[Docker Hub][autoscaler_dockerhub].
+Nomad. It runs as a daemon process, often referred to as the [Autocaler Agent][autoscaler_agent].
+An Autoscaler Agent is a separate and distinct process from a Nomad Agent. The 
+source code can be viewed on [GitHub][autoscaler_github] and releases are available
+on the [HashiCorp releases page][autoscaler_releases] or via [Docker Hub][autoscaler_dockerhub].
 
 The Nomad Autoscaler repository includes a number of [demos][autoscaler_demo]
-which provide guided learning on running the autoscaler.
+which provide guided learning on running the Nomad AutoScaler. Since Autoscaler
+Agent runs as its own daemon, it requires its own configuration. Configuration
+can be passed as command line flags or parsed from a configuration file. The demos
+repository includes an example [config][autoscaler_config] file that is useful to
+reference when configuring your Autoscaler Agent.
 
 ## Horizontal Application Autoscaling
 
@@ -61,3 +66,5 @@ specification [`scaling` block][scaling_block].
 [autoscaler_releases]: https://releases.hashicorp.com/nomad-autoscaler/
 [autoscaler_dockerhub]: https://hub.docker.com/r/hashicorp/nomad-autoscaler
 [autoscaler_demo]: https://github.com/hashicorp/nomad-autoscaler-demos
+[autoscaler_config]: https://github.com/hashicorp/nomad-autoscaler-demos/blob/1ecd9f32c749f1faaf4154b8a7e57fa68642fd33/cloud/demos/on-demand-batch/aws/jobs/autoscaler.nomad.tpl#L20
+[autoscaler_agent]: /tools/autoscaling/agent