Fix typos and update several links in notebook «Advanced RAG on Hugging Face»

[rnckp]

• Fix some typos
• Add some missing words
• Update several links

Btw: Very helpful notebooks - thanks for making this available. Very much appreciated. 👍

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[aymeric-roucher]

After undoing the change that I mentioned, all will be perfect! Thank you for adding these changes @rnckp 🤗

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[merveenoyan]

@rnckp thanks for the nits, I left two comments

[rnckp]

@merveenoyan @aymeric-roucher I have changed the code according to your comments. 👍