fix list syntax

Author: aaronpk

README.md

@@ -11,8 +11,8 @@ These extensions are:
 
 ## Extensions
 
-* [Client Credentials](https://github.com/modelcontextprotocol/ext-auth/blob/main/specification/draft/oauth-client-credentials.mdx)
-* [Enterprise-Managed Authorization](https://github.com/modelcontextprotocol/ext-auth/blob/main/specification/draft/enterprise-managed-authorization.mdx)
+- [Client Credentials](https://github.com/modelcontextprotocol/ext-auth/blob/main/specification/draft/oauth-client-credentials.mdx)
+- [Enterprise-Managed Authorization](https://github.com/modelcontextprotocol/ext-auth/blob/main/specification/draft/enterprise-managed-authorization.mdx)
 
 ## Governance