Doc fix for Shareable Kedro-viz.

[rashidakanchwala]

NOTE: Kedro datasets are moving from kedro.extras.datasets to a separate kedro-datasets package in
kedro-plugins repository. Any changes to the dataset implementations
should be done by opening a pull request in that repository.

Description

Updated to docs to reflect the correct fsspec the user needs to download which is fsspec[s3] which will also download 's3fs' dependency.

Development notes

Checklist

• Read the contributing guidelines
• Signed off each commit with a Developer Certificate of Origin (DCO)
• Opened this PR as a 'Draft Pull Request' if it is work-in-progress
• Updated the documentation to reflect the code changes
• Added a description of this change in the RELEASE.md file
• Added tests to cover my changes
• Checked if this change will affect Kedro-Viz, and if so, communicated that with the Viz team

[astrojuanlu]

Could you please signoff your commit so the DCO check passes? If you click on it you will find instructions. If it was only one commit you can do git commit --amend --signoff --no-edit, if you had more, git rebase --signoff. After rewriting the history you will need to do git push --force.

And if you keep working on this branch, please use the -s/--signoff flag when committing, for example git commit -s -m 'Add feature'.

[stichbury]

🌟

[astrojuanlu]

Sorry that was my stored reply for signoffs 🥹