Merge pull request #23 from thtrummer/develop

Add missing parameters in documentation (#9713)

doc/mpi.qbk

@@ -110,7 +110,7 @@ prints a message to standard output.
   #include <mpi.h>
   #include <iostream>
 
-  int main()
+  int main(int argc, char* argv[])
   {
     MPI_Init(&argc, &argv);