Fix typo

stable/chronograf/README.md

 # Chronograf
 
-##  An Open-Source Time Series Database
+##  An Open-Source Time Series Visualization Tool
 
 [Chronograf](https://github.com/influxdata/chronograf) is an open-source web application built by the folks over at [InfluxData](https://influxdata.com) and written in Go and React.js that provides the tools to visualize your monitoring data and easily create alerting and automation rules.
 
@@ -92,4 +92,4 @@ $ helm install --name my-release -f values.yaml stable/chronograf
 
 The [Chronograf](https://quay.io/influxdb/chronograf) image stores data in the `/var/lib/chronograf` directory in the container.
 
-The chart optionally mounts a [Persistent Volume](kubernetes.io/docs/user-guide/persistent-volumes/) volume at this location. The volume is created using dynamic volume provisioning.
\ No newline at end of file
+The chart optionally mounts a [Persistent Volume](kubernetes.io/docs/user-guide/persistent-volumes/) volume at this location. The volume is created using dynamic volume provisioning.