disable descriptive option

src/main/resources/templates/lab/view.html

@@ -51,7 +51,7 @@
                               th:action="@{/request/{id}/update-room/(id=${request.getId()})}">
                             <div class="form-group">
                                 <select class="custom-select custom-select-md" name="room">
-                                    <option>Update your room</option>
+                                    <option disabled>Choose your new room</option>
                                     <option th:each="room : ${lab.getFilteredRooms()}" th:value="${room.getId()}"
                                             th:selected="${request.room.equals(room)}">
                                         [[${room}]]