fix(plugins): Fix broken link in plugins readme

Another link to setup instructions that it is broken.

docs/sources/plugins/development.md

@@ -34,7 +34,7 @@ and [apps](./apps.md) plugins in the documentation.
 ## Start developing your plugin
 There are two ways that you can start developing a Grafana plugin.
 
-1. Setup a Grafana development environment. [(described here)](https://github.com/grafana/grafana/blob/master/DEVELOPMENT.md) and place your plugin in the ```data/plugins``` folder.
+1. Setup a Grafana development environment. [(described here)](http://docs.grafana.org/project/building_from_source/) and place your plugin in the ```data/plugins``` folder.
 2. Install Grafana and place your plugin in the plugins directory which is set in your [config file](../installation/configuration.md). By default this is `/var/lib/grafana/plugins` on Linux systems.
 3. Place your plugin directory anywhere you like and specify it grafana.ini.