docs: Fix build warnings in libgcrypt and blsuki doc

docs: Fix build warnings in libgcrypt and blsuki doc

Following warnings are thrown during libgrcypt and bluski doc build:

  grub.texi:4744: warning: node next pointer for `gcry_arcfour_module' is `gcry_blake2_module' but next is `gcry_aria_module' in menu
  grub.texi:4744: warning: node prev pointer for `gcry_arcfour_module' is `gcry_aria_module' but prev is `functional_test_module' in menu
  grub.texi:4751: warning: node prev pointer for `gcry_blake2_module' is `gcry_arcfour_module' but prev is `gcry_aria_module' in menu
  grub.texi:8532: warning: node next pointer for `trust' is `unset' but next is `uki' in menu
  grub.texi:8549: warning: node next pointer for `unset' is `uki' but next is `verify_detached' in menu
  grub.texi:8549: warning: node prev pointer for `unset' is `trust' but prev is `uki' in menu
  grub.texi:8557: warning: node next pointer for `uki' is `verify_detached' but next is `unset' in menu
  grub.texi:8557: warning: node prev pointer for `uki' is `unset' but prev is `trust' in menu
  grub.texi:8600: warning: node prev pointer for `verify_detached' is `uki' but prev is `unset' in menu

Fix order of gcry_aria_module and unset nodes.

Signed-off-by: Sridhar Markonda <sridharm@linux.ibm.com>
Reviewed-by: Andrew Hamilton <adhamilt@gmail.com>
Reviewed-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
Reviewed-by: Avnish Chouhan <avnish@linux.ibm.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>