[Cin] DAR, PAR and SAR, again

[Andrea paz]

> if whole line still fit window .... why not. Just ... you see we have
> new explainer right there. Old tutorials will be confusing if we
> change this element

You are right, better to keep W/H Ratio.

I attach the latest version of the text (I really hope it is the
latest!). I hope it is clearer than the previous ones.
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