documentation: need to update how-to-build section of Open MPI for the v5.0.0 release

[hppritcha]

We should make sure this table - https://docs.open-mpi.org/en/v5.0.x/installing-open-mpi/required-support-libraries.html?highlight=prrte

before releasing 5.0.0.

We should also add a section about how to support native launch (esp. via srun) with the 5.0.x release stream.