Fix rich editor tooltip typo for insert attachments button (#734)

修复富文本组件的显示提示信息

Co-authored-by: Ryan Wang <i@ryanc.cc>
Co-authored-by: John Niang <johnniang@riseup.net>

src/components/editor/DefaultEditor.vue

@@ -266,7 +266,7 @@ const toolbarMenuItems = computed(() => {
     {
       type: "button",
       icon: markRaw(MdiFileImageBox),
-      title: "SuperScript",
+      title: "插入附件",
       action: () => (attachmentSelectorModal.value = true),
       isActive: () => false,
     },