Instead of using the home_bump for Z to move close to the bed before doing a slow probe, use the probe travel height.

If `PROBE_DOUBLE_TOUCH` wasn't enabled, the probe move could be way too short! See #4701 for example.

Also improve the documentation of this and related options, and set
EXTRUDE_MINTEMP to 170 everywhere.

by switching off the tests for the probe before the stow move.

endstop trigger point. The move is stopped at endstop, so current_position
should also be adjusted to reflect this!

Caused error in subsequent call in endstop adjustment, since the movement
would assume a wrong starting position.

・Add missing ';'