docs: update alt text of wechat.png with a more meaningful description

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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@ -747,4 +747,5 @@ User Groups:
discord: <https://discord.gg/V4sAZ9XWpN>
<img src="assets/wechat.png" alt="PicoClaw" width="512">
WeChat:
<img src="assets/wechat.png" alt="WeChat group QR code" width="512">