Add doc for sparse triangular solve functions (grafted from 852660641a039f042fa1ebbb1b76d3cbaea7a7b0)
Add doc for sparse triangular solve functions
(grafted from 852660641a039f042fa1ebbb1b76d3cbaea7a7b0)

ROCmSoftwarePlatform/hipeigen,ROCmSoftwarePlatform/hipeigen,ROCmSoftwarePlatform/hipeigen,ROCmSoftwarePlatform/hipeigen