Update src/oss/javascript/releases/langchain-v1.mdx

Author: npentrel

src/oss/javascript/releases/langchain-v1.mdx

@@ -38,7 +38,7 @@ bun add langchain@next @langchain/core@next
 ```
 </CodeGroup>
 
-For a complete list of changes, see the [migration guide](/oss/langchain/middleware#built-in-middleware/migrate/langchain-v1).
+For a complete list of changes, see the [migration guide](/oss/migrate/langchain-v1).
 
 ## `createAgent`