x/image: Link to SVG color spec is outdated

[codesoap]

Go version

any

Output of go env in your module/workspace:

doesn't matter

What did you do?

I went to https://pkg.go.dev/golang.org/x/image/colornames and read the documentation of the golang.org/x/image/colornames package.

What did you see happen?

I found the link http://www.w3.org/TR/SVG/types.html#ColorKeywords, but when following it, I didn't find any information about the colors.

What did you expect to see?

I expected to see a definition of the colors, that are available in the golang.org/x/image/colornames package.

I suggest to update the link to https://www.w3.org/TR/SVG11/single-page.html#types-ColorKeywords.

[ianlancetaylor]

CC @nigeltao

[codesoap]

I've just found, that there is also https://www.w3.org/TR/SVG11/types.html#ColorKeywords. This might be preferable to the single-page version of the specification.

[gopherbot]

Change https://go.dev/cl/599835 mentions this issue: colornames: update link to SVG spec