Merge pull request #34 from Javier-lz/patch-1

Update webcam_plot.md

Author: haixuanTao

docs/guides/getting-started/webcam_plot.md

@@ -39,6 +39,7 @@ This example will launch a webcam plot stream.
 4. Start attached to the dataflow as follows:
 
    ```bash
+   dora up 
    dora start dataflow.yml --attach --hot-reload --name webcam
    ```