docs: Add note to cpu_family table about endianess [skip ci]
docs: Add note to cpu_family table about endianess [skip ci]

Autotools will add endianess to the name of the architecture in some
cases (such as ppc64le vs ppc64) meson doesn't do this. It's worth
noting this in the documentation.

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