Again say that submitters can request "fast track" procedure
    
    Before 8000ebabc9a2a67fd29ed0dbf92630849faa15b0, the text said "The fast-track
    procedure must be specifically requested by the person submitting the proposal
    or a FESCo member". Let's make it so again.
    
    Noticed in https://pagure.io/fesco/issue/3088#comment-880840.
    
    Also, say that FESCo members may remove the ticket from the Fast Track
    procedure, even without voting -1. Fast Track is supposed to be consensusual, so
    if people don't agree, we should use the normal procedure.