Minor changes to match help output notes for disconnect command
with UEFI Shell 2.2 specification document.
Few other formatting changes to fit the help output in 80x25 screen size.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Tapan Shah <tapandshah@hpe.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>