fix: typo fix in contribution chapter of react (#30230)

Hi there, while I was reading through the document, I found a tiny typo out there,
` you are a active contributor--> you are an active contributor.`

So I request a PR for this, hope it can help. 

Cheers.

docs/react/contributing.en-US.md

@@ -72,4 +72,4 @@ After cloning antd, run `npm install` to fetch its dependencies. Then, you can r
 
 ## Being a collaborator
 
-If you are a active contributor and are willing to work with Ant Design Team in our opensource workflow, you can [apply to be a outside collaborator](https://github.com/ant-design/ant-design/wiki/Collaborators#how-to-apply-for-being-a-collaborator).
+If you are an active contributor and are willing to work with Ant Design Team in our opensource workflow, you can [apply to be a outside collaborator](https://github.com/ant-design/ant-design/wiki/Collaborators#how-to-apply-for-being-a-collaborator).