Fix copypasta in test case description

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/tests/suites/test_suite_mpi.data b/tests/suites/test_suite_mpi.data
index 6cd62f1..aa58c94 100644
--- a/tests/suites/test_suite_mpi.data
+++ b/tests/suites/test_suite_mpi.data
@@ -1157,10 +1157,10 @@
 mpi_random_many:0:"04":1000
 
 MPI random in range: 2..4
-mpi_random_many:1:"04":1000
+mpi_random_many:2:"04":1000
 
 MPI random in range: 3..4
-mpi_random_many:1:"04":1000
+mpi_random_many:3:"04":1000
 
 MPI random in range: smaller result
 mpi_random_sizes:1:"aaaaaaaaaaaaaaaabbbbbbbbbbbbbbbb":1:0