mod a file name of the additional chapter

[y-yosuke]

and mod. *.py description with *.py in the additional chapter.

[y-yosuke]

Error Messages in building doc for kinetic.

writing... 
Exception occurred:
  File "/usr/local/lib/python2.7/dist-packages/docutils/nodes.py", line 625, in __getitem__
    return self.attributes[key]
KeyError: 'prefix'
The full traceback has been saved in /tmp/sphinx-err-AN4mhX.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!
CMakeFiles/docbuild_tork_moveit_tutorial_kinetic.dir/build.make:57: recipe for target 'CMakeFiles/docbuild_tork_moveit_tutorial_kinetic' failed
make[3]: *** [CMakeFiles/docbuild_tork_moveit_tutorial_kinetic] Error 2
CMakeFiles/Makefile2:323: recipe for target 'CMakeFiles/docbuild_tork_moveit_tutorial_kinetic.dir/all' failed
make[2]: *** [CMakeFiles/docbuild_tork_moveit_tutorial_kinetic.dir/all] Error 2
CMakeFiles/Makefile2:330: recipe for target 'CMakeFiles/docbuild_tork_moveit_tutorial_kinetic.dir/rule' failed
make[1]: *** [CMakeFiles/docbuild_tork_moveit_tutorial_kinetic.dir/rule] Error 2
Makefile:277: recipe for target 'docbuild_tork_moveit_tutorial_kinetic' failed
make: *** [docbuild_tork_moveit_tutorial_kinetic] Error 2

Exited with code exit status 2

[y-yosuke]

sphinx-doc/sphinx#5519