remove terms of DAG/Flex

docs/how-to-guides/tracing/trace-ui.md

@@ -4,10 +4,7 @@
 This is an experimental feature, and may change at any time. Learn [more](../faq.md#stable-vs-experimental).
 :::
 
-Prompt flow provides several trace toolkits in `promptflow-devkit`. This page will introduce trace UI, where user can better capture and visualize the internal execution details for all flows:
-
-- For `DAG flow`, user can track and visualize node level inputs/outputs of flow execution, it provides critical insights for developer to understand the internal details of execution. 
-- For `Flex flow` developers, who might use different frameworks (langchain, semantic kernel, OpenAI, kinds of agents) to create LLM based applications, prompt flow allow user to instrument their code in a [OpenTelemetry](https://opentelemetry.io/) compatible way, and visualize using UI provided by promptflow devkit.
+Prompt flow provides several trace toolkits in `promptflow-devkit`. This page will introduce trace UI, where user can better capture and visualize the internal execution details for flows. With trace UI, user can track and visualize flow execution, which provides critical insights for developer to understand the internal details of execution.
 
 ## Overview