tweak installation instructions

4 jobs for misc_fixes in 4 minutes and 54 seconds (queued for 12 seconds)
Status Name Job ID Coverage
  Test
passed test_min #166276

00:01:46

passed test_mpi #166277

00:03:12

passed test_mpi_fftw #166278

00:03:42

passed test_mpi_fftw_hdf5 #166279

00:04:43

57.0%