#3816 Fix mpi/training operator installation doc Pull request opened by iaroslav-ciupin Tracking issue Describe your changes MPI operator is actually not needed. Training operator can run MPI tasks as well. Check all the applicable boxes ☑︎ I updated the documentation accordingly. ☐ All new and existing tests passed. ☑︎ All commits are signed-off. Screenshots Note to reviewers flyteorg/flyte ✅ All checks have passed 6/6 successful checks