PR hpc#1853: tutorial: fix missing hello.py in output

Author: VladimirFokow

doc/tutorial.rst

@@ -426,8 +426,8 @@ Let’s pull that image and see how it looks::
   hello.2
   $ ch-convert hello.2 ./hello.2
   $ ls ./hello.2
-  bin    etc    lib    mnt    proc   run    srv    tmp    var
-  dev    home   media  opt    root   sbin   sys    usr
+  bin  ch  dev  etc  hello.py  home  lib  lib64  media  mnt
+  opt  proc  root  run  sbin  srv  sys  tmp  usr  var
 
 
 MPI Hello World