Remove unused variable (modelcontextprotocol#172)

The client program will work even if the variable `tool_results` is removed

Author: ftnext

quickstart/client.mdx

@@ -162,7 +162,6 @@ async def process_query(self, query: str) -> str:
     )
 
     # Process response and handle tool calls
-    tool_results = []
     final_text = []
 
     assistant_message_content = []
@@ -176,7 +175,6 @@ async def process_query(self, query: str) -> str:
 
             # Execute tool call
             result = await self.session.call_tool(tool_name, tool_args)
-            tool_results.append({"call": tool_name, "result": result})
             final_text.append(f"[Calling tool {tool_name} with args {tool_args}]")
 
             assistant_message_content.append(content)