Class name should be changed on the text-bbox-gradient.svg file

[JasonDuquain]

On the following SVG file (inside the inline style elment) there is a class declaration of tspan.em. I think this needs to be updated to tspan.highlight in order for the vertical gradient to be applied.

text-bbox-gradient.svg

If that is correct Example12-X2 can also be updated on this page:

ch12-bounding-boxes.html