docs: Don't keep temporary files around
    
    In my previous fix (1310b1358) I've tried to solve an ordering
    issue.  Well, while it worked it has a side effect of keeping a
    temporary file around. My patch was buggy in that sense. Solve
    this by properly marking the dependency without any side effect.
    
    Signed-off-by: Michal Privoznik <mprivozn@redhat.com>