Improve Superinterface copy

Author: Nedomas

clients.mdx

@@ -125,13 +125,12 @@ Theia AI and Theia IDE's MCP integration provide users with flexibility, making
 - [Download the AI-powered Theia IDE](https://theia-ide.org/)
 
 ### Superinterface
-[Superinterface](https://superinterface.ai) is AI infrastructure and developer platform to build in-app AI assistants with support for MCP, interactive components, client-side function calling and more.
+[Superinterface](https://superinterface.ai) is AI infrastructure and a developer platform to build in-app AI assistants with support for MCP, interactive components, client-side function calling and more.
 
 **Key features:**
 - Use tools from MCP servers in assistants embedded via React components or script tags
 - SSE transport support
 - Use any AI model from any AI provider (OpenAI, Anthropic, Ollama, others)
-- OpenAI Assistants API support
 
 ## Adding MCP support to your application