Document how to set the default name_prefix and name_suffix [skip ci]
Document how to set the default name_prefix and name_suffix [skip ci]

Else people (like me) try to use the old behaviour where
setting it to `''` would use the default.

https://gitlab.gnome.org/GNOME/glib-networking/issues/33
QuLogic/meson,mesonbuild/meson,jpakkane/meson,QuLogic/meson,thiblahute/meson,mesonbuild/meson,becm/meson,QuLogic/meson,QuLogic/meson,pexip/meson,jpakkane/meson,becm/meson,thiblahute/meson,thiblahute/meson,QuLogic/meson,jpakkane/meson,pexip/meson,QuLogic/meson,pexip/meson,MathieuDuponchelle/meson,thiblahute/meson,jeandet/meson,jpakkane/meson,jeandet/meson,mesonbuild/meson,QuLogic/meson,MathieuDuponchelle/meson,jeandet/meson,pexip/meson,jpakkane/meson,MathieuDuponchelle/meson,thiblahute/meson,thiblahute/meson,jpakkane/meson,MathieuDuponchelle/meson,becm/meson,thiblahute/meson,jpakkane/meson,jpakkane/meson,becm/meson,QuLogic/meson,MathieuDuponchelle/meson,mesonbuild/meson,pexip/meson,becm/meson,pexip/meson,thiblahute/meson,pexip/meson,pexip/meson,becm/meson,jeandet/meson,mesonbuild/meson,jeandet/meson,becm/meson,jeandet/meson,mesonbuild/meson,becm/meson,becm/meson,mesonbuild/meson,jpakkane/meson,mesonbuild/meson,pexip/meson,jeandet/meson,becm/meson,MathieuDuponchelle/meson,QuLogic/meson,mesonbuild/meson,MathieuDuponchelle/meson,mesonbuild/meson,MathieuDuponchelle/meson,jeandet/meson,MathieuDuponchelle/meson,thiblahute/meson,jeandet/meson,pexip/meson