docs: expand tooltip vs. popover info

[hellogreg]

What I did

1. Reworked the text for tooltips vs. popovers, paying extra attention to the technical differences (contents, close buttons, triggering and dimissal)

Testing Instructions

1. View the updated Tooltip vs. Popover section and ensure the content is sufficient and well-written!

[changeset-bot]

⚠️ No Changeset found

Latest commit: f0d2a3a

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[github-actions]

Size Change: -1 B (0%)

Total Size: 202 kB

Filename	Size	Change
./elements.js	472 B	-1 B (-0.21%)

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_{compressed-size-action}

[markcaron]

Library Guidance: Tooltip Mode