All links to "default sizing algorithm" are deadlink

[violette77]

All the occurrences of "default sizing algorithm" in section https://svgwg.org/svg2-draft/geometry.html#Sizing and https://svgwg.org/svg2-draft/embedded.html#ImageElement point to a deadlink: https://www.w3.org/TR/css-images-3/#default-sizing

The correct link should be https://www.w3.org/TR/css3-images/#default-sizing-algorithm

[dirkschulze]

Thanks @violette77 for reporting the issue. We probably should create an entry for "default sizing algorithm" here: https://github.com/w3c/svgwg/blob/master/master/definitions.xml#L860 and reference it from those sections.