Add extra clarification about fs_args

[merelcht]

Description

Follow up on kedro-org/kedro-plugins#805

Development notes

On top of updating the docstrings of the individual datasets, I added an extra example to the fs_args explanation.

Developer Certificate of Origin

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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

[ElenaKhaustova]

Thank you, @merelcht, LGTM!

[astrojuanlu]

Thanks Merel!