Remove some old code comments

Marlin/Marlin.ino

  * This firmware is a mashup between Sprinter and grbl.
  *  - https://github.com/kliment/Sprinter
  *  - https://github.com/simen/grbl/tree
- *
- * It has preliminary support for Matthew Roberts advance algorithm
- *  - http://reprap.org/pipermail/reprap-dev/2011-May/003323.html
  */
 
-/* All the implementation is done in *.cpp files to get better compatibility with avr-gcc without the Arduino IDE */
-/* Use this file to help the Arduino IDE find which Arduino libraries are needed and to keep documentation on GCode */
-
 #include "MarlinConfig.h"
 
 #if ENABLED(ULTRA_LCD)

Marlin/Marlin_main.cpp

  * This firmware is a mashup between Sprinter and grbl.
  *  - https://github.com/kliment/Sprinter
  *  - https://github.com/simen/grbl/tree
- *
- * It has preliminary support for Matthew Roberts advance algorithm
- *  - http://reprap.org/pipermail/reprap-dev/2011-May/003323.html
  */
 
 /**