Update docstring in _check_for_final_output_from_tools to reflect correct return type

Author: Abishai-kashif

src/agents/_run_impl.py

@@ -961,7 +961,10 @@ async def _check_for_final_output_from_tools(
         context_wrapper: RunContextWrapper[TContext],
         config: RunConfig,
     ) -> ToolsToFinalOutputResult:
-        """Returns (i, final_output)."""
+        """Determine if tool results should produce a final output.
+        Returns:
+            ToolsToFinalOutputResult: Indicates whether final output is ready, and the output value.
+        """
         if not tool_results:
             return _NOT_FINAL_OUTPUT