Update index.mdx

Author: fpagny

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

@@ -142,11 +142,11 @@ Then, we will embed them as vectors and store these vectors in your PostgreSQL d
    ```python
    text_splitter = RecursiveCharacterTextSplitter(chunk_size=500, chunk_overlap=0, add_start_index=True, length_function=len, is_separator_regex=False)
    file_loader = S3DirectoryLoader(
-       bucket=os.getenv("SCW_BUCKET_NAME", ""),
+       bucket=os.getenv("SCW_BUCKET_NAME"),
        prefix="",
-       endpoint_url=os.getenv("SCW_BUCKET_ENDPOINT", ""),
-       aws_access_key_id=os.getenv("SCW_ACCESS_KEY", ""),
-       aws_secret_access_key=os.getenv("SCW_SECRET_KEY", "")
+       endpoint_url=os.getenv("SCW_BUCKET_ENDPOINT"),
+       aws_access_key_id=os.getenv("SCW_ACCESS_KEY"),
+       aws_secret_access_key=os.getenv("SCW_SECRET_KEY")
    )
    for file in file_loader.lazy_load():
        chunks = text_splitter.split_text(file.page_content)