updating-linuxcnc.txt: add Lathe Configurations JA
updating-linuxcnc.txt: add Lathe Configurations JA

Discuss historical lathe configs with unused coordinate (Y)
and explain and recommend use of
  [KINS]KINEMATICS = trivkins coordinates=XZ
for lathes with joints_axes incorporation

also: move stricter syntax section

Signed-off-by: Dewey Garrett <546ec366615570e68497e3c5df9092106a9808f4@panix.com>

ikcalB/linuxcnc-mirror,ikcalB/linuxcnc-mirror,ikcalB/linuxcnc-mirror,ikcalB/linuxcnc-mirror,ikcalB/linuxcnc-mirror,ikcalB/linuxcnc-mirror,ikcalB/linuxcnc-mirror