Man pages for MPI_Pready* use a wrong signature

[jprotze]

Thank you for taking the time to submit an issue!

Background information

What version of Open MPI are you using?

main (a24343d)

Details of the problem

The man pages use MPI_Request* request rather than MPI_Request request:

https://github.com/open-mpi/ompi/blob/main/docs/man-openmpi/man3/MPI_Pready.3.rst

Same for MPI_Pready_range and MPI_Pready_list

[jsquyres]

@jprotze Thank you for notifying us of the issue -- I've filed a PR against main and will cherry pick it over to v5.0.x when it merges.