Bring example configs up to date (#11939)

Marlin/src/config/examples/Tronxy/X3A/Configuration_adv.h

@@ -339,6 +339,17 @@
   #endif
 #endif
 
+//#define Z_TRIPLE_STEPPER_DRIVERS
+#if ENABLED(Z_TRIPLE_STEPPER_DRIVERS)
+  //#define Z_TRIPLE_ENDSTOPS
+  #if ENABLED(Z_TRIPLE_ENDSTOPS)
+    #define Z2_USE_ENDSTOP _XMAX_
+    #define Z3_USE_ENDSTOP _YMAX_
+    #define Z_TRIPLE_ENDSTOPS_ADJUSTMENT2  0
+    #define Z_TRIPLE_ENDSTOPS_ADJUSTMENT3  0
+  #endif
+#endif
+
 /**
  * Dual X Carriage
  *