docs: OpenAPI request URL (#4071)

Author: shaohuzhang1

ui/src/layout/layout-header/avatar/APIKeyDialog.vue

@@ -87,7 +87,7 @@ const props = defineProps({
 })
 const emit = defineEmits(['addData'])
 
-const apiUrl = window.location.origin + +`${window.MaxKB.prefix}/api-doc/`
+const apiUrl = window.location.origin + `${window.MaxKB.prefix}/api-doc/`
 const SettingAPIKeyDialogRef = ref()
 const dialogVisible = ref<boolean>(false)
 const loading = ref(false)