COMPMID-1170 Updated Doxygen

- Removed references to old validation test suite
- Updated folders hierarchy
- Fixed NDK commands formatting
- Updated changelog for 18.05

Change-Id: I8e82c11298b5d837efd5056ac7c37668556c8e2c
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/132047
Reviewed-by: Pablo Tello <pablo.tello@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
2 files changed