Better wording for comments in config

Fixes fontconfig/fontconfig#274
11 jobs for issue/274 in 6 minutes and 15 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
passed meson android arm64 fedora #11288511

00:01:20

passed meson macos #11288509
gst-macos-10.15

00:03:04

passed meson-mingw-w64-build #11288506

00:05:35

manual meson msys2 #11288510
docker windows 1809 allowed to fail manual
passed meson-shared-build #11288504

00:06:14

passed meson-static-build #11288505

00:03:58

passed meson vs2017 amd64 #11288507
docker windows 1809

00:01:19

passed meson vs2017 x86 #11288508
docker windows 1809

00:01:20

passed mingw-build #11288503

00:04:10

passed shared-build #11288501

00:05:24

passed static-build #11288502

00:03:57