bug#14279: [PATCH] Mistake in shell-command-on-region docstring

[Juri Linkov]

> If OUTPUT-BUFFER is nil, *Shell Command Output*' is used,
> contrary to what the docstring says.
>
>  Optional fourth arg OUTPUT-BUFFER specifies where to put the
>  command's output.  If the value is a buffer or buffer name, put
> -the output there.  Any other value, including nil, means to
> +the output there.  Any other value, excluding nil, means to
>  insert the output in the current buffer.  In either case, the
>  output is inserted after point (leaving mark after it).

Thanks, fixed.