bug#32917: 27.0.50; read-hide-char documentation

[Eli Zaretskii <eliz@gnu.org>]

> Date: Tue, 02 Oct 2018 21:47:32 +0200
> From: charles@aurox.ch (Charles A. Roelli)
> 
> Here's a suggested change for emacs-26:
> 
> diff --git a/src/minibuf.c b/src/minibuf.c
> index 691fad0..f1bde91 100644
> --- a/src/minibuf.c
> +++ b/src/minibuf.c
> @@ -2107,8 +2107,11 @@ properties.  */);
>  
>    DEFVAR_LISP ("read-hide-char", Vread_hide_char,
>  	       doc: /* Whether to hide input characters in noninteractive mode.
> -It must be a character, which will be used to mask the input
> -characters.  This variable should never be set globally.  */);
> +If non-nil, it must be a character, which will be used to mask the
> +input characters.  This variable should never be set globally.
> +
> +This variable also overrides the default character that `read-passwd'
> +uses to hide passwords.  */);

This is OK, thanks.  Please also add an index entry for read-hide-char
in the ELisp manual, where read-passwd is described, because every
variable mentioned in the manual must be indexed.