tombrazier

- Added a link from the `M306` documentation to the main MPC documentation. - Added instructions to tune MPC manually (e.g. for PTC hotends). - Added instructions to calculate filament...

### Description #27204 improves calibration movements. This PR fixes a copy/paste error and a spacing issue.

### Description #25791 broke an assumption in `Backlash::get_applied_steps()` by changing the meaning of the initial state of `last_direction_bits`. This variable is initialised to zero, which used to mean that at...

### Description When `Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN` is defined, `NUM_ENDSTOP_STATES` can end up being incorrect. This is because `NUM_ENDSTOP_STATES` is assigned the value `Z_MIN_PROBE + 1` by the compiler and, in this particular...