Remove obsolete comment

Marlin/Configuration_adv.h

  * print acceleration will be reduced during the affected moves to keep within the limit.
  *
  * See https://marlinfw.org/docs/features/lin_advance.html for full instructions.
- * Mention @Sebastianv650 on GitHub to alert the author of any issues.
  */
 //#define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)