Change url link

Marlin/language.h

@@ -53,7 +53,7 @@
   #define FIRMWARE_URL "https://github.com/fmalpartida/Marlin/tree/SAV-MkI-config"
 #elif MB(WITBOX)
   #define MACHINE_NAME "WITBOX"
-  #define FIRMWARE_URL "http://www.bqreaders.com/descargas-witbox.html"
+  #define FIRMWARE_URL "https://github.com/MarlinFirmware/Marlin"
 #else
   #ifdef CUSTOM_MENDEL_NAME
     #define MACHINE_NAME CUSTOM_MENDEL_NAME