docs(langchain): update redirect url of "this langsmith conceptual guide" in tracing.mdx (#32776)

…ge (issue : #32775)

- **Description: updated the redirect url of "this langsmith conceptual
guide" in tracing.mdx
  - **Issue:** fixes #32775

---------

Co-authored-by: Adithya <[email protected]>
Co-authored-by: Mason Daugherty <[email protected]>

Author: 3 people

docs/docs/concepts/tracing.mdx

@@ -7,4 +7,4 @@ Traces contain individual steps called `runs`. These can be individual calls fro
 tool, or sub-chains.
 Tracing gives you observability inside your chains and agents, and is vital in diagnosing issues.
 
-For a deeper dive, check out [this LangSmith conceptual guide](https://docs.smith.langchain.com/concepts/tracing).
+For a deeper dive, check out [this LangSmith conceptual guide](https://docs.langchain.com/langsmith/observability-quickstart).