disp_th_moments.m: cosmetic changes

9 jobs for third_order_moments in 64 minutes and 44 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #19741
build_binaries

00:11:00

passed #19742
build_doc

00:01:50

 
  Test And Pkg
passed #19745
macOS
pkg_macOS

00:12:56

passed #19743
pkg_source

00:01:49

passed #19744
pkg_windows

00:33:31

passed #19749
test_dynare++

00:11:48

passed #19746
test_matlab

00:53:41

manual #19748
allowed to fail manual
test_octave
manual #19747
allowed to fail manual
test_old_matlab