updated building from source docs

docs/sources/project/building_from_source.md

@@ -57,7 +57,7 @@ For this you need nodejs (v.6+).
 ```bash
 npm install -g yarn
 yarn install --pure-lockfile
-yarn watch
+yarn start
 ```
 
 ## Running Grafana Locally
@@ -145,4 +145,4 @@ Please contribute to the Grafana project and submit a pull request! Build new fe
 ## Logging in for the first time
 
 To run Grafana open your browser and go to the default port http://localhost:3000 or the port you have configured.
-Then follow the instructions [here](/guides/getting_started/).
+Then follow the instructions [here](/guides/getting_started/).