Right now, it talks about styles on the individual flair but not the group flair.
I checked by tring it out and the flair style can be used on the group profile too.
So underneath the "… and for the combined Stack Exchange flair:" and the html code, it might say:
"You can also apply the clean, dark and hotdog styles to the combined profile."
Also when it says add the parameter to the end of the URL it might be a good idea to say "e.g. if the URL contains "image.jpg" make that "image.jps?theme=dark", keeping the rest of the code the same.
Finally for the combined profile it might (but not really sure) be a good idea, that with the above changes, add the additional styled examples, similar to the way they are shown above for the individual flair.