fr: Synchronize /Web/CSS/Shorthand_properties with upstream (#14637)

* fr: Replace tables in CSS shorthand properties page

* Update (and slightly improve) the article based on current en-US version

* now it should be even prettier

* Minor typofix

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Co-authored-by: SphinxKnight <[email protected]>
Co-authored-by: Carolyn Wu <[email protected]>