[Docs] Improve "Overlay mask" prop table

[weronikaolejniczak]

The purpose of this task is to improve the Overlay mask prop table. Compared to the old docs, it shows too many irrelevant props.

Old docs	New docs

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Migrated from the internal tracker (elastic/eui-private#235) to allow external contributions.

[github-actions]

👋 Thank you for your suggestion or request! While the EUI team agrees that it's valid, it's unlikely that we will prioritize this issue on our roadmap. We'll leave the issue open if you or anyone else in the community wants to implement it by contributing to EUI. If not, this issue will auto close in one year.

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