Other than his physical appearance, my knowledge on the life and career of Frank Zappa was nil;  which is why I was anticipating the documentary Zappa.  Because if a filmmaker is going to educate me on the legacy of a prolific musician, it’s documentarian Alex Winter.  Recently known for his return as Bill S. Preston Esq. in Bill & Ted Face The Music, music aficionado Winter is also one of the best documentarians currently working…