emacs-28 5bfac7c774 2/2: Provide reference for OTF tags in the ELisp manual

[Eli Zaretskii]

branch: emacs-28
commit 5bfac7c7747895c9d743d2a0edd25cb4317ea629
Author: Eli Zaretskii <eliz@gnu.org>
Commit: Eli Zaretskii <eliz@gnu.org>

    Provide reference for OTF tags in the ELisp manual
    
    * doc/lispref/display.texi (Low-Level Font): Provide the canonical
    reference URL for OTF tags.
---
 doc/lispref/display.texi | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi
index d9e93160ea..61aca5b88a 100644
--- a/doc/lispref/display.texi
+++ b/doc/lispref/display.texi
@@ -3866,7 +3866,10 @@ required; and @code{gpos} is a list of OpenType GPOS 
feature tag
 symbols, or @code{nil} if none is required.  If @code{gsub} or
 @code{gpos} is a list, a @code{nil} element in that list means that
 the font must not match any of the remaining tag symbols.  The
-@code{gpos} element may be omitted.
+@code{gpos} element may be omitted.  For the list of OpenType script,
+language, and feature tags, see
+@uref{https://docs.microsoft.com/en-us/typography/opentype/spec/ttoreg,
+the list of registered OTF tags}.
 
 @item :type
 @cindex font backend