Missing span and svg in AccName chapter

[JAWS-test]

I miss the elements span and svg in the chapter "5th Accessible Name and Description Computation". Shouldn't they be included in https://w3c.github.io/html-aam/#text-level-elements-not-listed-elsewhere or elsewhere?

[scottaohara]

span (among many other elements) will be covered when work is completed on #160 (it will be prohibited from receiving a name) and other issues related to naming that already exist.

svgs should be covered in https://github.com/w3c/svg-aam/

Thanks