update api link (#6303)

docs/docs_skeleton/docs/get_started/introduction.mdx

@@ -62,4 +62,4 @@ Join us on [GitHub](https://github.com/hwchase17/langchain) or [Discord](https:/
 
 ## API reference
 
-Head to the [reference](https://api.python.langchain.com/en/dev2049-docs_docusaurus/) section for full documentation of all classes and methods in the LangChain Python package.
+Head to the [reference](https://api.python.langchain.com) section for full documentation of all classes and methods in the LangChain Python package.

docs/docs_skeleton/sidebars.js

@@ -93,7 +93,7 @@ module.exports = {
     },
     {
        type: "link",
-       href: "https://api.python.langchain.com/en/dev2049-docs_docusaurus/",
+       href: "https://api.python.langchain.com",
        label: "API reference",
     },
   ],