COMPMID-1521: Update doxygen for 18.08

Change-Id: I4b74ed98caba85ed3ca4f6be261e883acaee8d1f
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/144875
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
1 file changed