fix: 修改文案为文案是“指定对象”

src/views/message/question-notifications/components/contentPanel.vue

@@ -104,7 +104,7 @@
         value-key="id"
         @click="openNameTree"
         @change="openNameTree"
-        placeholder="Select"
+        placeholder="指定对象"
         size="small"
         style="width: 150px; margin-left: 4px"
         multiple