Re: minor doc patch for libtextstyle

[Bruno Haible]

Hi Simon,

> Adjusting outdated links and updates the status on hyperlinks in the 
> terminal

Thanks! Very much appreciated.

> # libtextstyle/doc/libtextstyle.texi, 337-339
>   You need a recent version of the respective terminal emulator program.
> -See @url{https://gist.github.com/XVilka/8346728} for the most recent
> +See @url{https://github.com/termstandard/colors} for the most recent
>   developments in this area.

Applied; thanks.

> # libtextstyle/doc/libtextstyle.texi, 482-484
>   (Cascading Style Sheet) syntax.  See
> -@url{https://www.w3.org/TR/css2/cover.html} for a formal definition of
> +@url{https://www.w3.org/TR/CSS22/} for a formal definition of
>   CSS.  Many HTML authoring tutorials also contain explanations of CSS.

Here I prefer to reference https://www.w3.org/TR/CSS2/, because it's a
W3C "Recommendation" (= near standard), whereas https://www.w3.org/TR/CSS22/
is merely a "Working Draft". Cf. https://www.w3.org/standards/types/#x1-summary

> # libtextstyle/doc/libtextstyle.texi, 668-677
>   Text output may contain hyperlinks.  These hyperlinks are encoded through
>   an escape sequence, specified at
>   @url{https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda,
> -Hyperlinks in terminal emulators}.  Currently (as of 2019), they are
> -displayed only in @code{gnome-terminal} version 3.26 or above.  More
> +Hyperlinks in terminal emulators}.  Currently (as of 2024), they are
> +displayed in many modern terminals, see
> +@url{https://github.com/Alhadis/OSC8-Adoption, OSC8-Adoption}.  More

Applied; thanks. I occasionally tested 20 terminal emulators; glad to see
that someone else has now taken over the part of testing and documenting
this support.

Bruno