Re: [w3c/manifest] Example suggests that `icons` `sizes` mean a minimum size, but normative text doesn't support that (#925)

Yep, I think this is unclear.

However, I don't think we want to make normative text that says that sizes means it can be used for greater than or equal to that size. User agents should be able to use any icon size wherever they want; the sizes should just be used as a hint (i.e., it should have no normative description of how it's to be used).

We definitely shouldn't say that sizes is only for bitmap images. It should represent the ideal logical size in pixels of an image, so it's relevant on an SVG to say "this is the best image to use if you have a space to draw the icon that's about 257 logical pixels". You may have multiple SVGs that, while they can be scaled to any size, some have more detail than others, and are designed for different logical sizes.

@phoglenix also recently noted the normative term "appropriate" which seemingly has no definition, and should be clarified.

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