Add note about TMC2225/6 (#20002)

Marlin/Configuration.h

@@ -674,6 +674,8 @@
  *
  * A4988 is assumed for unspecified drivers.
  *
+ * Use TMC2208/TMC2208_STANDALONE for TMC2225 drivers and TMC2209/TMC2209_STANDALONE for TMC2226 drivers.
+ *
  * Options: A4988, A5984, DRV8825, LV8729, L6470, L6474, POWERSTEP01,
  *          TB6560, TB6600, TMC2100,
  *          TMC2130, TMC2130_STANDALONE, TMC2160, TMC2160_STANDALONE,