[LyX/master] Cleanup documentation about old XML support.

[Thibaut Cuvelier]

commit b9b0ac1b6ccded5c39480665744caf7eef9c522a
Author: Thibaut Cuvelier <tcuvelier at lyx.org>
Date:   Mon Dec 26 01:32:00 2022 +0100

    Cleanup documentation about old XML support.
---
 lib/doc/Customization.lyx |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/doc/Customization.lyx b/lib/doc/Customization.lyx
index 8a11dcf..e36cb2a 100644
--- a/lib/doc/Customization.lyx
+++ b/lib/doc/Customization.lyx
@@ -14664,9 +14664,6 @@ string
 \end_inset
 
 ] Copies all the features of an existing style into the current one.
-
-\change_deleted 1075283030 1671679775
-
 \change_inserted 1075283030 1671679774
 
 \end_layout
@@ -14681,6 +14678,8 @@ status collapsed
 
 \change_inserted 1075283030 1671679781
 DocBookGenerateTitle
+\change_unchanged
+
 \end_layout
 
 \end_inset
@@ -14720,6 +14719,8 @@ status collapsed
 
 \change_inserted 1075283030 1671679828
 DocBookWrapperTag
+\change_unchanged
+
 \end_layout
 
 \end_inset