Docs: expand description and include warning about proper usage
Docs: expand description and include warning about proper usage

This should be pushed up to master AFAIK they are the same

Signed-off-by: John Thornton <601166b5efca3d35ab1942428a84fb6f8bcae6cc@gnipsel.com>

mhaberler/machinekit,kinsamanka/machinekit,cnc-club/linuxcnc,bmwiedemann/linuxcnc-mirror,kinsamanka/machinekit,narogon/linuxcnc,RunningLight/machinekit,araisrobo/machinekit,unseenlaser/machinekit,cnc-club/linuxcnc,ArcEye/MK-Qt5,kinsamanka/machinekit,ikcalB/linuxcnc-mirror,strahlex/machinekit,cdsteinkuehler/MachineKit,ArcEye/MK-Qt5,mhaberler/machinekit,araisrobo/machinekit,EqAfrica/machinekit,EqAfrica/machinekit,aschiffler/linuxcnc,jaguarcat79/ILC-with-LinuxCNC,ikcalB/linuxcnc-mirror,strahlex/machinekit,mhaberler/machinekit,narogon/linuxcnc,bobvanderlinden/machinekit,mhaberler/machinekit,ikcalB/linuxcnc-mirror,ArcEye/machinekit-testing,bmwiedemann/linuxcnc-mirror,strahlex/machinekit,ArcEye/MK-Qt5,bobvanderlinden/machinekit,araisrobo/machinekit,kinsamanka/machinekit,unseenlaser/linuxcnc,RunningLight/machinekit,ikcalB/linuxcnc-mirror,ArcEye/machinekit-testing,bobvanderlinden/machinekit,narogon/linuxcnc,araisrobo/machinekit,bmwiedemann/linuxcnc-mirror,Cid427/machinekit,mhaberler/machinekit,araisrobo/linuxcnc,ianmcmahon/linuxcnc-mirror,cnc-club/linuxcnc,cnc-club/linuxcnc,kinsamanka/machinekit,bmwiedemann/linuxcnc-mirror,Cid427/machinekit,ArcEye/MK-Qt5,aschiffler/linuxcnc,EqAfrica/machinekit,mhaberler/machinekit,RunningLight/machinekit,araisrobo/linuxcnc,unseenlaser/linuxcnc,cdsteinkuehler/MachineKit,jaguarcat79/ILC-with-LinuxCNC,cdsteinkuehler/linuxcnc,unseenlaser/linuxcnc,ArcEye/MK-Qt5,kinsamanka/machinekit,cdsteinkuehler/linuxcnc,unseenlaser/machinekit,bmwiedemann/linuxcnc-mirror,araisrobo/linuxcnc,araisrobo/linuxcnc,ianmcmahon/linuxcnc-mirror,mhaberler/machinekit,EqAfrica/machinekit,bmwiedemann/linuxcnc-mirror,EqAfrica/machinekit,aschiffler/linuxcnc,cnc-club/linuxcnc,Cid427/machinekit,ArcEye/machinekit-testing,cdsteinkuehler/MachineKit,bobvanderlinden/machinekit,unseenlaser/machinekit,cdsteinkuehler/MachineKit,EqAfrica/machinekit,ArcEye/machinekit-testing,EqAfrica/machinekit,cdsteinkuehler/linuxcnc,bobvanderlinden/machinekit,ianmcmahon/linuxcnc-mirror,cnc-club/linuxcnc,jaguarcat79/ILC-with-LinuxCNC,Cid427/machinekit,narogon/linuxcnc,aschiffler/linuxcnc,strahlex/machinekit,strahlex/machinekit,cdsteinkuehler/linuxcnc,mhaberler/machinekit,cdsteinkuehler/linuxcnc,araisrobo/machinekit,araisrobo/machinekit,cnc-club/linuxcnc,ianmcmahon/linuxcnc-mirror,EqAfrica/machinekit,kinsamanka/machinekit,bobvanderlinden/machinekit,araisrobo/machinekit,ArcEye/machinekit-testing,ianmcmahon/linuxcnc-mirror,strahlex/machinekit,RunningLight/machinekit,unseenlaser/linuxcnc,narogon/linuxcnc,ikcalB/linuxcnc-mirror,RunningLight/machinekit,unseenlaser/machinekit,Cid427/machinekit,unseenlaser/machinekit,ArcEye/machinekit-testing,RunningLight/machinekit,Cid427/machinekit,ianmcmahon/linuxcnc-mirror,ikcalB/linuxcnc-mirror,ikcalB/linuxcnc-mirror,araisrobo/machinekit,jaguarcat79/ILC-with-LinuxCNC,RunningLight/machinekit,bobvanderlinden/machinekit,unseenlaser/machinekit,cdsteinkuehler/MachineKit,ArcEye/MK-Qt5,strahlex/machinekit,araisrobo/linuxcnc,unseenlaser/linuxcnc,Cid427/machinekit,ianmcmahon/linuxcnc-mirror,aschiffler/linuxcnc,ArcEye/machinekit-testing,Cid427/machinekit,bobvanderlinden/machinekit,ArcEye/MK-Qt5,jaguarcat79/ILC-with-LinuxCNC,unseenlaser/machinekit,kinsamanka/machinekit,araisrobo/machinekit,cdsteinkuehler/linuxcnc,bmwiedemann/linuxcnc-mirror,RunningLight/machinekit,ArcEye/machinekit-testing,ArcEye/MK-Qt5,unseenlaser/machinekit,cdsteinkuehler/MachineKit