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Update grub.texi to describe the external environment block in the reserved area of Btrfs header used for grub-reboot and savedefault, and add a section documenting the saved_entry, next_entry, and env_block variables. Signed-off-by: Michael Chang <mchang@suse.com> Reviewed-by: Neal Gompa <ngompa13@gmail.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>