doc: update UEFI documentation
* UEFI variables can be persisted
* describe that the sequence of files loaded before bootefi matters
Signed-off-by: 
Heinrich Schuchardt <xypron.glpk@gmx.de>
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* UEFI variables can be persisted
* describe that the sequence of files loaded before bootefi matters
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>