removes testdata from getting started

docs/sources/guides/getting_started.md

@@ -69,7 +69,7 @@ The image above shows you the top header for a Dashboard.
 
 ## Dashboards, Panels, the building blocks of Grafana...
 
-Dashboards are at the core of what Grafana is all about. Dashboards are composed of individual Panels arranged on a grid. Grafana ships with a variety of Panels. Grafana makes it easy to construct the right queries, and customize the display properties so that you can create the perfect Dashboard for your need. Each Panel can interact with data from any configured Grafana Data Source (currently Graphite, Prometheus, Elasticsearch, InfluxDB, OpenTSDB, MySQL, PostgreSQL, Microsoft SQL Server, AWS Cloudwatch, and TestData). The [Basic Concepts](/guides/basic_concepts) guide explores these key ideas in detail.
+Dashboards are at the core of what Grafana is all about. Dashboards are composed of individual Panels arranged on a grid. Grafana ships with a variety of Panels. Grafana makes it easy to construct the right queries, and customize the display properties so that you can create the perfect Dashboard for your need. Each Panel can interact with data from any configured Grafana Data Source (currently Graphite, Prometheus, Elasticsearch, InfluxDB, OpenTSDB, MySQL, PostgreSQL, Microsoft SQL Server and AWS Cloudwatch). The [Basic Concepts](/guides/basic_concepts) guide explores these key ideas in detail.
 
 <img src="/img/docs/v50/dashboard_annotated.png" class="no-shadow" width="700px">