delete-char not fully documented

[Thierry Volpiatto <thierry.volpiatto@gmail.com>]

Hi every one,
i just realized that `delete-char' is not fully documented:

Both in info and in the docstring.

delete-char use two arg, one for the number of char to delete and one to
push to kill-ring.

,----[ C-h f delete-char RET ]
| delete-char is an interactive built-in function in `C source code'.
| 
| It is bound to <deletechar>, C-d.
| 
| (delete-char n &optional killflag)
| 
| Delete the following n characters (previous if n is negative).
| Optional second arg killflag non-nil means kill instead (save in kill ring).
| Interactively, n is the prefix arg, and killflag is set if
| n was explicitly specified.
| 
| [back]
| 
| ===*===*===*===*===*===*===*===*===*===*===
`----

That work as intended.
But when used interactively it have an extra feature that work like:

,----
| (defun del-reg (beg end)
|   (interactive "r")
|   (delete-region beg end))
`----


I think that need explanation somewhere in manual and docstring. 

-- 
A + Thierry Volpiatto
Location: Saint-Cyr-Sur-Mer - France