Update more broken LUFA links (#26383)

docs/compatible_microcontrollers.md

@@ -6,7 +6,7 @@ Features within QMK may or may not be compatible with every microcontroller.
 
 ## Atmel AVR
 
-The following use [LUFA](https://www.fourwalledcubicle.com/LUFA.php) as the USB stack:
+The following use [LUFA](https://github.com/abcminiuser/lufa) as the USB stack:
 
 * [ATmega16U2](https://www.microchip.com/wwwproducts/en/ATmega16U2) / [ATmega32U2](https://www.microchip.com/wwwproducts/en/ATmega32U2)
 * [ATmega16U4](https://www.microchip.com/wwwproducts/en/ATmega16U4) / [ATmega32U4](https://www.microchip.com/wwwproducts/en/ATmega32U4)

platforms/avr/bootloaders/dfu.c

@@ -23,7 +23,7 @@
 
 /** \brief Entering the Bootloader via Software
  *
- * http://www.fourwalledcubicle.com/files/LUFA/Doc/120730/html/_page__software_bootloader_start.html
+ * https://github.com/abcminiuser/lufa/blob/master/LUFA/DoxygenPages/SoftwareBootloaderJump.txt
  */
 #define BOOTLOADER_RESET_KEY 0xB007B007
 uint32_t reset_key __attribute__((section(".noinit,\"aw\",@nobits;")));