bug#30218: 27.0.50; Possibly incorrect statement in manual about string equality

[Eli Zaretskii]

> From: Philipp <p.stephani2@gmail.com>
> Date: Mon, 22 Jan 2018 23:50:16 +0100
> 
> 
> The manual says in the section "Equality Predicates":
> 
>      For technical reasons, a unibyte string
>      and a multibyte string are ‘equal’ if and only if they contain the
>      same sequence of character codes and all these codes are either in
>      the range 0 through 127 (ASCII) or 160 through 255
>      (‘eight-bit-graphic’).
> 
> However, that doesn't seem to be the case:
> 
> (equal (string #xA0) (unibyte-string #xA0)) => nil
> (equal (string #x3FFFA0) (unibyte-string #xA0)) => nil

Thanks, fixed.