Fix grammar in the rendering section.
Fix grammar in the rendering section.

Upon reading some docs, I found a small grammar mistake in the
rendering section. This patch fixes that.

sir-murray/wayland,tulcod/wayland,eyolfson/wayland,tulcod/wayland,mchalupa/wayland,tulcod/wayland,bitfactor/wayland,sir-murray/wayland,abooij/wayland,mchalupa/wayland,abooij/wayland,bitfactor/wayland,bitfactor/wayland,eyolfson/wayland,sir-murray/wayland,mchalupa/wayland,abooij/wayland,eyolfson/wayland