docs/config: fix RS274NGC_STARTUP_CODE example
docs/config: fix RS274NGC_STARTUP_CODE example

this had several errors in it
g1 with no feed
g92 with no axes
g1 canceled by g80
g64.1 doesnt exist

ArcEye/MK-Qt5,unseenlaser/linuxcnc,ikcalB/linuxcnc-mirror,Cid427/machinekit,ArcEye/MK-Qt5,cdsteinkuehler/linuxcnc,ArcEye/machinekit-testing,strahlex/machinekit,bmwiedemann/linuxcnc-mirror,kinsamanka/machinekit,aschiffler/linuxcnc,strahlex/machinekit,mhaberler/machinekit,unseenlaser/linuxcnc,Cid427/machinekit,unseenlaser/machinekit,kinsamanka/machinekit,unseenlaser/machinekit,mhaberler/machinekit,ianmcmahon/linuxcnc-mirror,cdsteinkuehler/MachineKit,Cid427/machinekit,narogon/linuxcnc,Cid427/machinekit,EqAfrica/machinekit,cdsteinkuehler/MachineKit,ArcEye/MK-Qt5,kinsamanka/machinekit,bmwiedemann/linuxcnc-mirror,kinsamanka/machinekit,narogon/linuxcnc,ArcEye/machinekit-testing,bobvanderlinden/machinekit,RunningLight/machinekit,narogon/linuxcnc,EqAfrica/machinekit,RunningLight/machinekit,ArcEye/machinekit-testing,aschiffler/linuxcnc,bobvanderlinden/machinekit,cdsteinkuehler/linuxcnc,aschiffler/linuxcnc,bobvanderlinden/machinekit,bobvanderlinden/machinekit,mhaberler/machinekit,araisrobo/linuxcnc,Cid427/machinekit,RunningLight/machinekit,araisrobo/machinekit,ikcalB/linuxcnc-mirror,strahlex/machinekit,araisrobo/linuxcnc,ianmcmahon/linuxcnc-mirror,unseenlaser/linuxcnc,ianmcmahon/linuxcnc-mirror,RunningLight/machinekit,ianmcmahon/linuxcnc-mirror,unseenlaser/machinekit,Cid427/machinekit,mhaberler/machinekit,strahlex/machinekit,bobvanderlinden/machinekit,Cid427/machinekit,bobvanderlinden/machinekit,mhaberler/machinekit,strahlex/machinekit,bmwiedemann/linuxcnc-mirror,araisrobo/linuxcnc,unseenlaser/machinekit,ArcEye/machinekit-testing,bobvanderlinden/machinekit,ikcalB/linuxcnc-mirror,kinsamanka/machinekit,cnc-club/linuxcnc,cdsteinkuehler/linuxcnc,ArcEye/MK-Qt5,unseenlaser/machinekit,ArcEye/MK-Qt5,araisrobo/machinekit,bmwiedemann/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,araisrobo/machinekit,aschiffler/linuxcnc,cnc-club/linuxcnc,EqAfrica/machinekit,bmwiedemann/linuxcnc-mirror,cnc-club/linuxcnc,mhaberler/machinekit,ArcEye/MK-Qt5,cdsteinkuehler/MachineKit,ianmcmahon/linuxcnc-mirror,aschiffler/linuxcnc,narogon/linuxcnc,araisrobo/machinekit,ArcEye/machinekit-testing,ikcalB/linuxcnc-mirror,RunningLight/machinekit,ianmcmahon/linuxcnc-mirror,ianmcmahon/linuxcnc-mirror,kinsamanka/machinekit,kinsamanka/machinekit,ikcalB/linuxcnc-mirror,cdsteinkuehler/MachineKit,cdsteinkuehler/linuxcnc,EqAfrica/machinekit,mhaberler/machinekit,kinsamanka/machinekit,EqAfrica/machinekit,ArcEye/machinekit-testing,ArcEye/MK-Qt5,EqAfrica/machinekit,unseenlaser/machinekit,cnc-club/linuxcnc,unseenlaser/machinekit,unseenlaser/machinekit,ikcalB/linuxcnc-mirror,EqAfrica/machinekit,strahlex/machinekit,RunningLight/machinekit,EqAfrica/machinekit,bobvanderlinden/machinekit,araisrobo/machinekit,araisrobo/linuxcnc,cnc-club/linuxcnc,cdsteinkuehler/MachineKit,cdsteinkuehler/MachineKit,RunningLight/machinekit,araisrobo/machinekit,araisrobo/machinekit,unseenlaser/linuxcnc,cdsteinkuehler/linuxcnc,narogon/linuxcnc,mhaberler/machinekit,ArcEye/MK-Qt5,RunningLight/machinekit,bmwiedemann/linuxcnc-mirror,unseenlaser/linuxcnc,araisrobo/machinekit,ArcEye/machinekit-testing,strahlex/machinekit,cdsteinkuehler/linuxcnc,araisrobo/linuxcnc,cnc-club/linuxcnc,Cid427/machinekit,araisrobo/machinekit,cnc-club/linuxcnc,ikcalB/linuxcnc-mirror,ArcEye/machinekit-testing