Substitute span element for label in html examples

As it turns out, label is an illegal html element to have inside an anchor (a).

So my page could validate against the w3c html validator, I substituted a span for the label in the step listing at the start of the wizard's html.  That's fine because none of the css or js depend on that element being a label, it just needs to carry the Stepnumber class and a span will do that as well as a label would (but better since it validates).

That's all that's in this commit.