updated readme again

README.md

 # Grafana - Graphite Dashboard
 # Grafana - Graphite Dashboard
 
 
-A beautifully, easy to use and feature rich Graphite dashboard replacement and graph editor. Visit [grafana.org](http://grafana.org) for screenshots and overview.
+A beautifully, easy to use and feature rich Graphite dashboard replacement and graph editor. Visit [grafana.org](http://grafana.org) for screenshots and an overview.
 
 
 # Features
 # Features
 ## Graphite Target Editor
 ## Graphite Target Editor