Update board/teensy comment (#19456)

.github/workflows/test-builds.yml

         - mega2560
         - teensy31
         - teensy35
+        - teensy41
         - SAMD51_grandcentral_m4
 
         # Extended AVR Environments

Marlin/src/core/boards.h

 
 #define BOARD_THE_BORG                5000  // THE-BORG (Power outputs: Hotend0, Hotend1, Bed, Fan)
 #define BOARD_REMRAM_V1               5001  // RemRam v1
-#define BOARD_TEENSY41                5002  // Teensy4.0 and Teensy4.1
-#define BOARD_T41U5XBB                5003  // T41U5XBB Teensy4.1 breakout board
+#define BOARD_TEENSY41                5002  // Teensy 4.1
+#define BOARD_T41U5XBB                5003  // T41U5XBB Teensy 4.1 breakout board
 
 //
 // Espressif ESP32 WiFi