i18n(zh-cn): update tutorial/6-islands/3.mdx (#4925)

Co-authored-by: Yan Thomas <61414485+Yan-Thomas@users.noreply.github.com>

src/content/docs/zh-cn/tutorial/6-islands/3.mdx

@@ -10,6 +10,7 @@ import Box from '~/components/tutorial/Box.astro';
 import Checklist from '~/components/Checklist.astro';
 import CompletionConfetti from '~/components/tutorial/CompletionConfetti.astro';
 import PreCheck from '~/components/tutorial/PreCheck.astro';
+import Button from '~/components/Button.astro';
 
 还有一个修改要进行……
 
@@ -60,3 +61,12 @@ const textCase = "uppercase";
 [加入我们的 Discord](https://astro.build/chat)
 
 <CompletionConfetti />
+
+## 分享你的成就！
+
+恭喜你已经完成了 Astro 博客教程！可以和世界分享你的这份成就，让每个人知道你现在是一个「宇航员」了！
+
+<div style="display: flex; flex-wrap: wrap; gap: 0.5rem;">
+  <Button href='https://twitter.com/intent/tweet?text=Just%20finished%20learning%20how%20to%20build%20my%20first%20Astro%20blog!%20Check%20it%20out%20at%20https://docs.astro.build/%0Avia%20%40astrodotbuild'>分享到 Twitter</Button>
+  <Button href='https://www.reddit.com/submit?url=https://docs.astro.build/&title=Just%20finished%20learning%20how%20to%20build%20my%20first%20Astro%20blog!'>分享到 Reddit</Button>
+</div>