Fix for the PR #5072 (Add predefined AUTO_FAN_PINs to pins files), etc

・Make descriptions the same as others

Marlin/example_configurations/delta/biv2.5/Configuration_adv.h

@@ -211,8 +211,8 @@
  * Extruder auto fans automatically turn on when their extruders'
  * temperatures go above EXTRUDER_AUTO_FAN_TEMPERATURE.
  *
- * Your board's pins file specifies the recommended pins.
- * Override those here. Set to -1 to disable unused fans.
+ * Your board's pins file specifies the recommended pins. Override those here
+ * or set to -1 to disable completely.
  *
  * Multiple extruders can be assigned to the same pin in which case
  * the fan will turn on when any selected extruder is above the threshold.