Nit: prepend contextual text instead of appending it to chunks in guide.ipynb

[FlorianPydde]

In your blob post, you mention that your prepend the context to the actual chunk but in the guide notebook it's the opposite. It probably doesn't affect performances but for consistency I thought I would raise it.

The line in question is this one (guide):
Current:

'text_to_embed': f"{chunk['content']}\n\n{contextualized_text}"

Corrected:

'text_to_embed': f"{contextualized_text}\n\n{chunk['content']}"