[OMPI users] Typo in MPI_Cart_coords man page

[Jeremiah Willcock]

The bottom of the MPI_Cart_coords man page (in SVN trunk as well as some 
releases) states:

The inverse mapping, rank-to-coordinates translation is provided by 
MPI_Cart_coords.

Although that is true, we are already in the man page for MPI_Cart_coords 
and so the reverse is the mapping from coordinates to rank.

-- Jeremiah Willcock