Fixed typo in paper demos.

5 jobs for master in 16 minutes and 54 seconds
Status Job ID Name Coverage
  Test
passed #239809
test_min

00:03:17

passed #239810
test_mpi

00:05:34

passed #239811
test_mpi_fftw

00:06:21

passed #239812
test_mpi_fftw_hdf5

00:10:34

64.0%
 
  Release
passed #239813
release_image_master

00:06:19