Docs: minor edits to Submakefile
Docs: minor edits to Submakefile

There were an assortment of edits here.
* Change source docs from lyx to txt
  (this was really done later by pattern
   substitutes, but still, removing lyx is good)
  (I'm leaving the "patsubst"s in, just in case)
* Break up target PDFs into separate lines to
  make it easier to do troubleshooting by swapping
  (this was very helpful)
* Re-order some other sources and targets to match
* Some minor typos, etc.


Signed-off-by: Kim Kirwan <83db02e1cba58c43d01116c50014913b47fa473b@KimKirwan.com>

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