Yoo Hoo, Mrs. Goldberg is a documentary that's now in limited release around the country. It's all about actress-writer Gertrude Berg, who was in some ways, the first TV situation comedy star. She was also a huge star on radio and even on the Broadway stage, but seems to have been largely forgotten. I haven't seen this new film about her but I hear good things about it from friends who have. Here's a look at the trailer…