typo: wrong translation in markdown.md

docs/zh/guide/markdown.md

@@ -891,7 +891,7 @@ $$ x = {-b \pm \sqrt{b^2-4ac} \over 2a} $$
 export default {
   markdown: {
     image: {
-      // 默认禁用图片懒加载
+      // 默认启用图片懒加载
       lazyLoading: true
     }
   }