Former “Degrassi” star Miriam McDonald has spoken out on social media amid criticism over her appearance in the trailer for the upcoming documentary, “Degrassi: Whatever It Takes.”McDonald, who portrayed Emma Nelson in “Degrassi: The Next Generation,” the fourth series of the “Degrassi” franchise, is one of the former stars of the long-running Canadian teen drama featured in the new documentary premiering at the Toronto International Film Festival Sept. 13.