Documentation: Rviz commands in sensors.md

[syedjawadakhtar]

When running rviz to view CoRa model, the command has to be corrected from

roslaunch vprc_gazebo rviz_vorc.launch

to

roslaunch vorc_gazebo rviz_vorc.launch

as vprc_gazebo isn't any package.

The other issue is that I can't find any rviz_vorc.launch in vorc_gazebo package.

I'm only able to launch rviz and view CoRa on executing the following command:

roslaunch vorc_gazebo rviz.launch

[caguero]

Thanks for reporting the issues. I have fixed the errors in https://github.com/osrf/vorc/wiki/sensors .