[skip ci] Use more up-to-date wording for package managers
[skip ci] Use more up-to-date wording for package managers

Most of the OSes Meson supports actually do have package managers,
and at least some of them are not harder to use than Linux ones.

becm/meson,QuLogic/meson,becm/meson,becm/meson,QuLogic/meson,mesonbuild/meson,mesonbuild/meson,becm/meson,mesonbuild/meson,QuLogic/meson,jpakkane/meson,mesonbuild/meson,mesonbuild/meson,jpakkane/meson,mesonbuild/meson,QuLogic/meson,pexip/meson,becm/meson,mesonbuild/meson,pexip/meson,pexip/meson,jpakkane/meson,becm/meson,jpakkane/meson,QuLogic/meson,jpakkane/meson,pexip/meson,pexip/meson,pexip/meson,becm/meson,mesonbuild/meson,mesonbuild/meson,QuLogic/meson,jpakkane/meson,QuLogic/meson,jpakkane/meson,pexip/meson,QuLogic/meson,jpakkane/meson,becm/meson,jpakkane/meson,QuLogic/meson,mesonbuild/meson,becm/meson,pexip/meson,becm/meson,pexip/meson,pexip/meson