macOS installer: update installer text to reflect recent changes; fix acronym for GCC

11 jobs for master in 69 minutes and 4 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #16301
build_binaries

00:13:06

passed #16302
build_doc

00:01:36

 
  Test And Pkg
passed #16305
macOS
pkg_macOS

00:13:39

passed #16303
pkg_source

00:02:04

passed #16304
pkg_windows

00:23:53

passed #16309
test_dynare++

00:15:49

passed #16306
test_matlab

00:54:35

manual #16308
allowed to fail manual
test_octave
manual #16307
allowed to fail manual
test_old_matlab
 
  Deploy
passed #16310
restricted
deploy_manual_unstable

00:00:14

passed #16311
restricted
deploy_snapshot_unstable

00:01:07