📝 Update PID_PARAMS_PER_HOTEND comment (#22694)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

Marlin/Configuration.h

@@ -595,8 +595,8 @@
                                   // Set/get with gcode: M301 E[extruder number, 0-2]
 
   #if ENABLED(PID_PARAMS_PER_HOTEND)
-    // Specify between 1 and HOTENDS values per array.
+    // Specify up to one value per hotend here, according to your setup.
-    // If fewer than EXTRUDER values are provided, the last element will be repeated.
+    // If there are fewer values, the last one applies to the remaining hotends.
     #define DEFAULT_Kp_LIST {  22.20,  22.20 }
     #define DEFAULT_Ki_LIST {   1.08,   1.08 }
     #define DEFAULT_Kd_LIST { 114.00, 114.00 }