docs[patch]: Update link (#23240)

CC @agola11

docs/docs/how_to/index.mdx

@@ -317,4 +317,4 @@ You can peruse [LangSmith how-to guides here](https://docs.smith.langchain.com/h
 Evaluating performance is a vital part of building LLM-powered applications.
 LangSmith helps with every step of the process from creating a dataset to defining metrics to running evaluators.
 
-To learn more, check out the [LangSmith evaluation how-to guides](https://docs.smith.langchain.com/how_to_guides/evaluation).
+To learn more, check out the [LangSmith evaluation how-to guides](https://docs.smith.langchain.com/how_to_guides#evaluation).