simplify heading

Home.md

@@ -10,7 +10,7 @@ Fluent UI React is a collection of robust React-based components designed to mak
 
 For information about basics of using Fluent UI React, and details of the different projects located in this repo, see the [README](https://github.com/microsoft/fluentui/blob/master/README.md).
 
-## Building and contributing
+## Contributing
 
 [Contributing to `@fluentui/react` and related packages](Contributing/Contributing)