Update "contributions"

Author: jspahrsummers

docs/specification/contributing/_index.md

@@ -6,10 +6,8 @@ cascade:
 breadcrumbs: false
 ---
 
-The Model Context Protocol specification welcomes contributions from the community.
-
-Please review our [contributing guidelines](https://github.com/modelcontextprotocol/specification/blob/main/CONTRIBUTING.md) for details on how to submit changes.
+We welcome contributions from the community! Please review our [contributing guidelines](https://github.com/modelcontextprotocol/specification/blob/main/CONTRIBUTING.md) for details on how to submit changes.
 
 All contributors must adhere to our [Code of Conduct](https://github.com/modelcontextprotocol/specification/blob/main/CODE_OF_CONDUCT.md).
 
-For questions and discussions, please use the [GitHub Discussion forums](https://github.com/modelcontextprotocol/specification/discussions).
+For questions and discussions, please use [GitHub Discussions](https://github.com/modelcontextprotocol/specification/discussions).