v3.1.x: MPI_Comm_spawn_multiple.3in: update Fortran string array notes

[jsquyres]

Per 0ab6b20, note in the MPI_Comm_spawn_multiple.3in man page that
the array_of_commands does not need to be terminated -- it just need
to have exactly "count" entries. In the Fortran binding, at least,
this is different than in prior released versions of Open MPI (it's
not a backwards incompatibility, since prior versions of Open MPI
required array_of_commands to be blank-string-terminated in Fortran --
this change makes Open MPI be less restrictive, and therefore still
backwards compatible).

Signed-off-by: Jeff Squyres jsquyres@cisco.com
(cherry picked from commit fc8ebbb)

[ggouaillardet]

FWIW, github allows you to push commits on existing PR even if you are not the author.

In this case, you could have

git remote add ggouaillardet https://jsquyres@github.com/ggouaillardet/ompi.git
git remote update ggouaillardet
git checkout topic/v3.1.x/topic/v3.1.x/fortran-arrays-of-strings-are-the-devil
git cherry-pick -x fc8ebbb0e09b83bfa19ad68dff4f07cb21c619cf
git push ggouaillardet topic/v3.1.x/topic/v3.1.x/fortran-arrays-of-strings-are-the-devil

[jsquyres]

@ggouaillardet Yeah, I'm aware. But you had already approved those PRs (and github doesn't remove the approval if commits are added) -- I didn't want to add commits to that which was already approved.