Update Reference-manual.md
Update Reference-manual.md

Fix documentation breakage from https://github.com/mesonbuild/meson/pull/2415
MathieuDuponchelle/meson,mesonbuild/meson,ernestask/meson,jeandet/meson,becm/meson,becm/meson,mesonbuild/meson,QuLogic/meson,trhd/meson,ernestask/meson,pexip/meson,ernestask/meson,MathieuDuponchelle/meson,becm/meson,mesonbuild/meson,QuLogic/meson,MathieuDuponchelle/meson,pexip/meson,QuLogic/meson,MathieuDuponchelle/meson,thiblahute/meson,jeandet/meson,jeandet/meson,QuLogic/meson,jpakkane/meson,jeandet/meson,pexip/meson,jpakkane/meson,pexip/meson,jeandet/meson,jpakkane/meson,jpakkane/meson,thiblahute/meson,ernestask/meson,trhd/meson,thiblahute/meson,becm/meson,trhd/meson,QuLogic/meson,jpakkane/meson,pexip/meson,QuLogic/meson,becm/meson,pexip/meson,pexip/meson,QuLogic/meson,ernestask/meson,jeandet/meson,pexip/meson,becm/meson,jpakkane/meson,trhd/meson,jpakkane/meson,thiblahute/meson,trhd/meson,mesonbuild/meson,thiblahute/meson,MathieuDuponchelle/meson,ernestask/meson,mesonbuild/meson,becm/meson,jeandet/meson,jpakkane/meson,becm/meson,jeandet/meson,MathieuDuponchelle/meson,trhd/meson,MathieuDuponchelle/meson,ernestask/meson,becm/meson,mesonbuild/meson,MathieuDuponchelle/meson,ernestask/meson,becm/meson,mesonbuild/meson,ernestask/meson,trhd/meson,pexip/meson,MathieuDuponchelle/meson,trhd/meson,thiblahute/meson,jeandet/meson,QuLogic/meson,mesonbuild/meson,mesonbuild/meson,trhd/meson,thiblahute/meson,pexip/meson,thiblahute/meson,mesonbuild/meson,jpakkane/meson,thiblahute/meson,QuLogic/meson