kdumpctl.8: Add description to reset-crashkernel --reboot
    
    Resolves: RHEL-42442
    Resolves: RHEL-22171
    
    commit 2c741555d9749e9a137378332e561382f9e25739
    Author: Philipp Rudo <prudo@redhat.com>
    Date:   Mon Jul 1 12:52:39 2024 +0200
    
        kdumpctl.8: Add description to reset-crashkernel --reboot
    
        There is no description for parameter --reboot for reset-crashkernel.
        Thus add one.
    
        Suggested-by: Lichen Liu <lichliu@redhat.com>
        Signed-off-by: Philipp Rudo <prudo@redhat.com>
    
    Signed-off-by: Philipp Rudo <prudo@redhat.com>