Update advanced-usage.md (#527)

Decided to add highlight documentation (it was not obvious for me co configure that)
flyerhq · Nov 21, 2023 · 9516174 · 9516174
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commit 9516174
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diff --git a/doc/advanced-usage.md b/doc/advanced-usage.md
@@ -598,4 +598,17 @@ if (_messages.where((e) => e.id == 'lastReadMessageId').isEmpty) {
     _chatKey.currentState?.scrollToUnreadHeader();
   });
 }
+```
+
+### Hightlight message on scroll
 
+In order to hightlight message on scrolling you need to setup `highlightMessageColor` for ChatTheme used. Then you can call scroll to message function like this:
+
+```dart
+scrollToMessage(
+  'messageId',
+  withHighlight: true,
+  // Default duration is 3 seconds
+  highlightDuration: const Duration(milliseconds: 1000), 
+);
+```