🐛 Fix M913 typos (#22385)

Marlin/src/gcode/feature/trinamic/M911-M914.cpp

         #endif
 
         case Z_AXIS:
-          TERN_(Z_HAS_STEALTCHOP, if (index < 2) TMC_SET_PWMTHRS(Z,Z));
-          TERN_(Z2_HAS_STEALTCHOP, if (index == 0 || index == 2) TMC_SET_PWMTHRS(Z,Z2));
-          TERN_(Z3_HAS_STEALTCHOP, if (index == 0 || index == 3) TMC_SET_PWMTHRS(Z,Z3));
-          TERN_(Z4_HAS_STEALTCHOP, if (index == 0 || index == 4) TMC_SET_PWMTHRS(Z,Z4));
+          TERN_(Z_HAS_STEALTHCHOP, if (index < 2) TMC_SET_PWMTHRS(Z,Z));
+          TERN_(Z2_HAS_STEALTHCHOP, if (index == 0 || index == 2) TMC_SET_PWMTHRS(Z,Z2));
+          TERN_(Z3_HAS_STEALTHCHOP, if (index == 0 || index == 3) TMC_SET_PWMTHRS(Z,Z3));
+          TERN_(Z4_HAS_STEALTHCHOP, if (index == 0 || index == 4) TMC_SET_PWMTHRS(Z,Z4));
           break;
         #if E_STEPPERS
           case E_AXIS: {