ros_overview: update depend tag

[s-a-tanjim]

the <run_depend> tag was replaced by <exec_depend>
Source: https://answers.ros.org/question/283123/what-is-the-difference-between-exec_depend-and-run_depend/

[mayman99]

Thank you for catching this!
But according to this http://docs.ros.org/en/jade/api/catkin/html/howto/format2/migrating_from_format_1.html , shouldn't we add <build_export_depend>foo</build_export_depend> as well?

[s-a-tanjim]

Oww my bad! Actually my program compiled fine without <build_export_depend>foo</build_export_depend>.
But I think adding <depend>foo</depend> is better option. Thanks anyway!