[template] Fix robot core template incorrect indentation

Reported by Pierrick and dieesrod at gmail dot com
[template] Fix builder robot template to be consistent with 177822de94

The commit pass 177822de94 directly the name to Robot.__init__ instead
of duplicating the code. So add this extra argument in the template.

Reported by dieesrod at gmail dot com
[doc] Improve a bit the doc about adding a robot

- Fix code snippet to be sync with the reality, in particularity with
  commit 177822de9
- Speak about morse-add command line for robot (fix #391)
[doc] Fix one spelling issue in adding component doc
[doc] Remove robot description rst file, doc is not generated

Close #284
[robots] Add missing _name for Patrolbot