[LyX/master] Update release notes

[Richard Kimberly Heck]

commit ea26cb222019b58119f13523df4834cb42ed9e40
Author: Richard Kimberly Heck <rikiheck at lyx.org>
Date:   Sun Dec 4 15:22:54 2022 -0500

    Update release notes
---
 lib/RELEASE-NOTES |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/lib/RELEASE-NOTES b/lib/RELEASE-NOTES
index f91b3d6..4d72f71 100644
--- a/lib/RELEASE-NOTES
+++ b/lib/RELEASE-NOTES
@@ -60,6 +60,11 @@
 * Documents that use TeX fonts can only be compiled with XeTeX if the input
   encoding is set to "utf8-plain" or "ascii".
 
+* With LyXHTML output, there are now different CSS classees generated for
+  different depths: enumi, enumii, enumiii, and enumiv, and similarly for
+  itemize: lyxitemi, etc. There is also a new HTMLClass tag, which makes it
+  easier to provide specific classes for paragraphs.
+
 * DocBook support has been revamped and now targets DocBook 5 (i.e.
   only XML, SGML is gone). Some supporting files for the previous
   implementation have been removed: all examples (lib/examples),