Clear old crashkernl=auto in comment and doc
    
    Resolves: bz1986250
    Upstream: Fedora
    
    commit 097059dedc987548742437bca6fd90793cf74c18
    Author: Kairui Song <kasong@redhat.com>
    Date:   Fri Jul 30 14:40:45 2021 +0800
    
        Clear old crashkernl=auto in comment and doc
    
        Acked-by: Pingfan Liu <piliu@redhat.com>
        Signed-off-by: Kairui Song <kasong@redhat.com>
    
    Signed-off-by: Kairui Song <kasong@redhat.com>