Follow-up the PR #4955, etc

・More ANALOG NUMBERING to Analog Input
・Add comment header to all the section of all the pins files

・Sort sections as follows:
1. Some special definitions (USBCON, LARGE_FLASH, etc)
2. Servos
3. Limit Switches
4. Z Probe
5. Steppers
6. Temperature Sensors
7. Heaters / Fans
8. Misc. Functions
9. LCD / Controller

・Move MAX6675_SS into "Temperature Sensors" section
・Adjust spacing

Marlin/pins_3DRAG.h

@@ -36,6 +36,9 @@
   #define DEFAULT_SOURCE_CODE_URL "http://3dprint.elettronicain.it/"
 #endif
 
+//
+// Heaters / Fans
+//
 #define RAMPS_D8_PIN 9
 #define RAMPS_D9_PIN 8
 #define MOSFET_D_PIN 12
@@ -55,7 +58,12 @@
 #define Z_ENABLE_PIN       63
 
 //
-// SD Card
+// Heaters / Fans
+//
+#define HEATER_2_PIN        6
+
+//
+// Misc. Functions
 //
 #undef SDSS
 #define SDSS               25
@@ -63,11 +71,6 @@
 #undef SD_DETECT_PIN
 #define SD_DETECT_PIN      53
 
-//
-// Heaters / Fans
-//
-#define HEATER_2_PIN        6
-
 //
 // LCD / Controller
 //