Update tutorials/how-to-implement-rag/index.mdx

Co-authored-by: Rémy Léone <[email protected]>

Author: Laure-di

tutorials/how-to-implement-rag/index.mdx

@@ -130,7 +130,7 @@ from langchain_postgres import PGVector
 
 ### Step 2: Configure OpenAI Embeddings
 
-We will utilize the OpenAIEmbeddings class from LangChain and store the embeddings in PostgreSQL using the PGVector integration.
+We will utilize the [OpenAIEmbeddings](https://api.python.langchain.com/en/latest/embeddings/langchain_openai.embeddings.base.OpenAIEmbeddings.html) class from LangChain and store the embeddings in PostgreSQL using the PGVector integration.
 
 ```python
 # rag.py