Merge pull request #80 from tidbcloud/baurine-patch-1

Update README.md

Author: sanshuiyijing

packages/playground/README.md

@@ -2,7 +2,7 @@
 
 ## Try it
 
-- [Full Featured Playground](https://tisqleditor.vercel.app/playgroud)
+- [Full Featured Playground](https://tisqleditor.vercel.app/playground)
 - [Simple Example](https://tisqleditor.vercel.app/examples?ex=all)
 
 ## Tech Stack