[LyX/master] Update release notes.

[Richard Kimberly Heck]

commit 0266b70a5ab9eaaf3b270697cf8b04c3c9fa17fb
Author: Richard Kimberly Heck <rikiheck at lyx.org>
Date:   Sun Nov 27 13:29:52 2022 -0500

    Update release notes.
---
 lib/RELEASE-NOTES |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/lib/RELEASE-NOTES b/lib/RELEASE-NOTES
index b57d1f7..8791c62 100644
--- a/lib/RELEASE-NOTES
+++ b/lib/RELEASE-NOTES
@@ -41,6 +41,9 @@
 * The actual enabled state of the synchronize TeX output option of the document
   is used to enable or disable the menu item for forward-search.
 
+* When using the document compare function, there is now an option to display the
+  differences using a special "Document Compare" author.
+
 !!Documents compilation process and images conversion
 
 * LyX now uses utf8 encoding per default for all languages. This does