SWDEV-288929 - update document for the flag __HIP_USE_CMPXCHG_FOR_FP_ATOMICS
SWDEV-288929 - update document for the flag __HIP_USE_CMPXCHG_FOR_FP_ATOMICS

Change-Id: If7027d6a63c524e4c829288fe794258c7ecbf064

ROCm-Developer-Tools/HIP,ROCm-Developer-Tools/HIP,ROCm-Developer-Tools/HIP,ROCm-Developer-Tools/HIP,ROCm-Developer-Tools/HIP