Merge pull request open-mpi#4632 from jsquyres/pr/v2.1.x/man-page-fix

v2.1.x: MPI_Attr_get: doc fix: MPI_Comm_create_attr -> MPI_Comm_get_attr

Author: jsquyres

ompi/mpi/man/man3/MPI_Attr_get.3in

@@ -50,7 +50,7 @@ Fortran only: Error status (integer).
 .SH DESCRIPTION
 .ft R
 Note that use of this routine is \fIdeprecated\fP as of MPI-2, and
-was \fIdeleted\fP in MPI-3. Please use MPI_Comm_create_attr.  This
+was \fIdeleted\fP in MPI-3. Please use MPI_Comm_get_attr.  This
 function does not have a C++ or mpi_f08 binding.
 .sp
 Retrieves attribute value by key. The call is erroneous if there is no key