Update the mpirun man page

This update should fix the mpirun man page so all
mpirun command line options are included, and
mpirun commands that have been removed are no
longer in the man page.  I also fixed some of
the file formatting, and bolding of command
parameters.

Signed-off-by: Nathaniel Graham <[email protected]>

(cherry picked from commit f9c05bd)

Author: Nathaniel Graham