Add warning about duplicate repositories after update

Author: pol-rivero

.github/github-desktop-plus-release-notes.md

@@ -2,9 +2,13 @@ GitHub Desktop Plus v3.5.13-beta1
 
 Upstream: [GitHub Desktop 3.5.13-beta1 release notes](https://github.com/desktop/desktop/releases/tag/release-3.5.13-beta1)
 
-> [!IMPORTANT]
+> [!NOTE]
 > This release removes our fork-specific implementation of Git Worktrees integration in favor of the new upstream implementation.  
-> Some worktree-related features may now work slightly differently than before.
+> Some worktree-related features may now work slightly differently than before.  
+
+> [!WARNING]
+> If you had repositories with worktrees before this release, those repositories may now appear as duplicates in your repository list. If you encounter this issue, you can simply remove the duplicates from the app.  
+> Make sure **NOT** to check the "Also move this repository to Trash" checkbox when removing the duplicates.
 
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