doc : update code, mention examples
doc : update code, mention examples

Zefz/eigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,ROCmSoftwarePlatform/hipeigen,pasuka/eigen,toastedcrumpets/eigen,ritsu1228/eigen,toastedcrumpets/eigen,toastedcrumpets/eigen,TSC21/Eigen,TSC21/Eigen,Zefz/eigen,ritsu1228/eigen,ritsu1228/eigen,ROCmSoftwarePlatform/hipeigen,Zefz/eigen,TSC21/Eigen,toastedcrumpets/eigen,Zefz/eigen,ritsu1228/eigen,pasuka/eigen,pasuka/eigen,pasuka/eigen,pasuka/eigen,ROCmSoftwarePlatform/hipeigen,TSC21/Eigen