[LyX/master] Some RELEASE-NOTES updates

[Juergen Spitzmueller]

commit 58828c3aa84b604707b002754c3a901e8646fd2b
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Tue Aug 4 11:53:27 2026 +0200

    Some RELEASE-NOTES updates
---
 lib/RELEASE-NOTES | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/RELEASE-NOTES b/lib/RELEASE-NOTES
index e4b2583e45..78621c7750 100644
--- a/lib/RELEASE-NOTES
+++ b/lib/RELEASE-NOTES
@@ -47,6 +47,10 @@
   the current buffer at once, instead of waiting for each image to be
   scrolled into view.
 
+- matter <TYPE> inserts structural divisions such as \fronmatter,
+  \mainmatter or \backmatter if the class supports it. The <TYPE>
+  argument is the command name without backslash.
+
 - keymap-select <NAME>: turns on and selects a keyboard map by name
   (the base name of a .kmap file). If NAME is omitted, any manual
   selection is dropped and the configured default (or, if
@@ -79,6 +83,9 @@
 
 !!!The following metadata files have been added to the tarball in 2.6:
 
+* listinglanguages holds the definition of the programming languages supported
+  by the program listings inset.
+
 !!Changes with respect to external programs and libraries in 2.6: