Incorrect documentation for unit_definitions.h

1. doxygen generates incorrect documentation for include/MantleAPI/Common/unit_definitions.h
2. When new macros are added to unit_definitions.h, doxygen has warnings about it. To observe see MR-181/08e9d81944991e3fc8feac20f1bb3a26286a173f and pipeline console

Macros usage is treated as function declaration.

To reproduce it perform "Build docs" from README.md