Fix link to CSSStyleSheet.insertRule
Fix link to CSSStyleSheet.insertRule

Link has /fela/ in it which results in a 404 page on MDN
RafalFilipek/fela,rofrischmann/fela,derek-duncan/fela,derek-duncan/fela,rofrischmann/fela,RafalFilipek/fela,derek-duncan/fela,derek-duncan/fela,RafalFilipek/fela,RafalFilipek/fela,derek-duncan/fela,rofrischmann/fela,risetechnologies/fela,derek-duncan/fela,risetechnologies/fela,RafalFilipek/fela,RafalFilipek/fela,risetechnologies/fela