docs: update sharing and visibility sections for designs and workspaces

[kirti763]

Notes for Reviewers

This PR fixes #497

Signed commits

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[vr-varad]

Thank you for your contribution! Let's discuss this during the website call today at 5:30 PM IST | 7 AM CT

Add it as an agenda item to the meeting minutes, if you would :)

[kirti763]

Done, @zihanKuang

[kirti763]

Hey @zihan just pushed the final tweaks! I was at KubeCon India and didn’t carry my laptop there, so thanks for the patience

[kirti763]

done , @zihanKuang! let me know if you’d like any additional wording tweaks

[Namanv0509]

Thank you for your contribution! Let's discuss this during the website call today at 5:30 PM IST | 7 AM CT

Add it as an agenda item to the meeting minutes, if you would :)

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[kishore08-07]

@kirti763 Thank you for your contribution! Let's discuss this during the website call today at 6:30 PM IST | 8 AM CT Add it as an agenda item to the meeting minutes, if you would :)