New translations merge.mdx (Vietnamese)

website/src/lib/docs/vi/toolbar/merge.mdx

@@ -5,6 +5,7 @@ title: Merge
 <script>
     import { Group } from '@lucide/svelte';
     import Merge from '$lib/components/toolbar/tools/Merge.svelte';
+    import DocsNote from '$lib/components/docs/DocsNote.svelte';
 </script>
 
 # <Group size="24" class="inline-block" style="margin-bottom: 5px" /> { title }
@@ -15,6 +16,13 @@ To use this tool, you need to [select](../files-and-stats) multiple files, [trac
 - The second option can be used to create or manage files with multiple [tracks or segments](../gpx).
   Merging files (or tracks) will result in a single file (or track) containing all tracks (or segments) from the selection.
 
+<DocsNote>
+
+Selected items are merged in the order they appear in the files list.
+Reorder items by drag-and-drop if needed.
+
+</DocsNote>
+
 <div class="flex flex-row justify-center">
     <Merge class="text-foreground p-3 border rounded-md shadow-lg" />
 </div>