Update README.md

typo

Author: chilijung

README.md

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 ## 🚧 Project Status
 Wren Engine is currently in the beta version. The project team is actively working on progress and aiming to release new versions at least biweekly.
 
-## 🛠️ Developer GuideS
+## 🛠️ Developer Guides
 The project consists of 4 main modules:
 1. [ibis-server](./ibis-server/): the Web server of Wren Engine powered by FastAPI and Ibis
 2. [wren-core](./wren-cores): the semantic core written in Rust powered by [Apache DataFusion](https://github.com/apache/datafusion)