docs(theming): some styling and content updates

[markcaron]

What I did

1. Some styling and content updates to the "Backgrounds and theme tokens" section of Theming —> Color palettes

Testing Instructions

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Latest commit: 5261bc8cd1b0c77c396a265f554bfe4490580868

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Size Change: 0 B

Total Size: 211 kB

ℹ️ View Unchanged

Filename	Size
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_{compressed-size-action}

[markcaron]

Waiting on patch release: #1972