Documentation for the sizing CSS classes is incorrect

[peytondmurray]

Describe the bug

See here - the CSS sizing classes should be

    sd-w-25, sd-h-25
    sd-w-50, sd-h-50
    sd-w-75, sd-h-75
    sd-w-100, sd-h-100
    sd-w-auto, sd-h-auto

to match the implementation: https://github.com/executablebooks/sphinx-design/blob/main/style/_sizing.scss.

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