Update comment for wlr_headless_backend_create
/**
* Creates a new wlr_wl_backend. This backend will be created with no outputs;
* you must use wlr_wl_output_create to add them.
+ *
+ * The `remote` argument is the name of the host compositor wayland socket. Set
+ * to NULL for the default behaviour (WAYLAND_DISPLAY env variable or wayland-0
+ * default)
*/
struct wlr_backend *wlr_wl_backend_create(struct wl_display *display, const char *remote);
