Fix grammar in contributing guidelines section

Author: SimranSahni42

README.md

@@ -26,7 +26,7 @@ This repo contains the source code and documentation powering [react.dev](https:
 
 ### Guidelines
 
-The documentation is divided into several sections with a different tone and purpose. If you plan to write more than a few sentences, you might find it helpful to get familiar with the [contributing guidelines](https://github.com/reactjs/react.dev/blob/main/CONTRIBUTING.md#guidelines-for-text) for the appropriate sections.
+The documentation is divided into several sections, each with a different tone and purpose. If you plan to write more than a few sentences, you might find it helpful to get familiar with the [contributing guidelines](https://github.com/reactjs/react.dev/blob/main/CONTRIBUTING.md#guidelines-for-text) for the appropriate sections.
 
 ### Create a branch