docs: Clearify swapLeftAndRightInRTL functionality

[HarwinBorger]

Current docs don’t clearly explain how swapLeftAndRightInRTL interacts with: • marginLeft / marginRight • paddingLeft / paddingRight • Absolute positioning (left / right) This leads to confusion, because developers may expect left / right to flip automatically, which it does not.

Also it's not clear what the default state of swapLeftAndRightInRTL is. This PR gives explaination on this behaviour.

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[HarwinBorger]

CLA is signed, github actions need a re-run

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