bug#6576: documentation `string-to-char' is incorrect

[Eli Zaretskii <eliz@gnu.org>]

> Date: Tue, 6 Jul 2010 17:34:41 -0400
> From: MON KEY <monkey@sandpframing.com>
> Cc: 
> 
> First sentence of doc string for `string-to-char' is incorrect.
> 
> ,---- (documentation 'string-to-char )
> | "Convert arg STRING to a character, the first character of that
> | string.  A multibyte character is handled correctly.
> |
> | (fn STRING)"
> `----
> 
> Should be something more like:
> 
>   "Return decimal integer value of first character in STRING."

The "decimal" thing has no place here, because we are not talking
about the printed representation of that integer.

I would suggest the following, which also takes care of the second
sentence in the current doc string:

  "Return the Unicode codepoint of the first character of STRING.
  Note: eight-bit characters are returned as single-byte values in the
  range 160 to 255, inclusive."