docs: remove incorrect T-word info in M6 description
docs: remove incorrect T-word info in M6 description

The T-word specifies the tool number (ie the tool id), *not* the slot
number (ie not the toolchanger magazine pocket id).

But in any case, surely the T-word is adequatly described in the section
describing the T-word, and doesn't need a repeat in the M6 section.
And the T-word section is linked from the M6 section, so i think we're
fine here.

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