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

The example in https://w3c.github.io/manifest/#icons-member says

> The developer wants to use an SVG for greater than or equal to 257x257px.

and shows

> ```json
> {
>   "src": "icon/hd_hi.svg",
>   "sizes": "257x257"
> }
> ```

to accomplish this, but the normative definitions of `sizes` don't appear to support this use.

* https://w3c.github.io/manifest/#icons-member mentions "appropriate images in `icons`" but doesn't define what's appropriate.
* https://w3c.github.io/manifest/#dfn-processing-manifestimageresource-members refers to https://www.w3.org/TR/image-resource/#dfn-process-an-image-resource-from-json which refers to https://html.spec.whatwg.org/multipage/links.html#rel-icon which says "The keyword represents that the resource contains a bitmap icon with a width of width device pixels and a height of height device pixels." which is _never_ true for a vector graphic like SVG.

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