docs: Minor clarifications of gnome.compile_resources
docs: Minor clarifications of gnome.compile_resources

This was causing confusion for a user about the fact any directory can be passed
mesonbuild/meson,pexip/meson,mesonbuild/meson,jeandet/meson,thiblahute/meson,mesonbuild/meson,MathieuDuponchelle/meson,jpakkane/meson,QuLogic/meson,MathieuDuponchelle/meson,jeandet/meson,pexip/meson,pexip/meson,QuLogic/meson,thiblahute/meson,MathieuDuponchelle/meson,mesonbuild/meson,mesonbuild/meson,QuLogic/meson,becm/meson,thiblahute/meson,MathieuDuponchelle/meson,jeandet/meson,jeandet/meson,becm/meson,QuLogic/meson,thiblahute/meson,pexip/meson,QuLogic/meson,MathieuDuponchelle/meson,pexip/meson,jeandet/meson,becm/meson,QuLogic/meson,MathieuDuponchelle/meson,QuLogic/meson,MathieuDuponchelle/meson,MathieuDuponchelle/meson,pexip/meson,becm/meson,becm/meson,becm/meson,pexip/meson,thiblahute/meson,jeandet/meson,thiblahute/meson,QuLogic/meson,becm/meson,thiblahute/meson,mesonbuild/meson,pexip/meson,jeandet/meson,becm/meson,jpakkane/meson,becm/meson,jpakkane/meson,jpakkane/meson,mesonbuild/meson,pexip/meson,QuLogic/meson,jpakkane/meson,jpakkane/meson,thiblahute/meson,thiblahute/meson,jpakkane/meson,jpakkane/meson,mesonbuild/meson,MathieuDuponchelle/meson,pexip/meson,becm/meson,jeandet/meson,jpakkane/meson,mesonbuild/meson,mesonbuild/meson,jeandet/meson