Document that new side-by-side diff screen can't show line endings

Change-Id: Ibd2e64d24e855756f3ec75d38c4cc97ef6718d0b
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/Documentation/user-review-ui.txt b/Documentation/user-review-ui.txt
index 3d5e418..d505a1c 100644
--- a/Documentation/user-review-ui.txt
+++ b/Documentation/user-review-ui.txt
@@ -1118,6 +1118,9 @@
 
 - The new side-by-side diff screen cannot render images.
 
+- The new side-by-side diff screen isn't able to highlight line
+  endings.
+
 - Unified diff view is missing:
 +
 By setting `Diff View (New Change Screen)` in the user preferences to