fixed additional notes

pages/[user]/book.tsx

@@ -64,7 +64,7 @@ export default function Book(props) {
             }).join("\n\n")
         }
         if (!!notes && !!event.target.notes.value) {
-            notes += "Additional notes:\n" + event.target.notes.value;
+            notes += "\n\nAdditional notes:\n" + event.target.notes.value;
         } else {
             notes += event.target.notes.value;
         }