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

Co-authored-by: Jessica <[email protected]>

Author: fpagny

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

@@ -117,7 +117,7 @@ embeddings = OpenAIEmbeddings(
    ```
 
    <Message type="tip">
-   You do not need to install pgvector manually using `CREATE EXTENSION vector` as Langchain will automatically detect it is not present and install it when calling adapter `PGVector`.
+   You do not need to install pgvector manually using `CREATE EXTENSION vector` as LangChain will automatically detect it is not present and install it when calling adapter `PGVector`.
    </Message>
 
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