message: Update documentation to remove references to nullptr
diff: @@ -96,9 +96,7 @@ Robot* RobotPool::addRobot(Robot::Type type, int id)
  /**
  - * Gets a Robodigger from the pool.
  - *
  - * \return Returns a pointer to an available Robodigger. If no digger is available, returns nullptr.
  + * Gets an idle Robodigger from the pool.
  */
  Robodigger* RobotPool::getDigger()
  {
  @@ -107,9 +105,7 @@ Robodigger* RobotPool::getDigger()
  /**
  - * Gets a Robodozer from the pool.
  - *
  - * \return Returns a pointer to an available Robodozer. If no dozer is available, returns nullptr.
  + * Gets an idle Robodozer from the pool.
  */
  Robodozer* RobotPool::getDozer()
  {
  @@ -118,9 +114,7 @@ Robodozer* RobotPool::getDozer()
  /**
  - * Gets a Robominer from the pool.
  - *
  - * \return Returns a pointer to an available Robominer. If no miner is available, returns nullptr.
  + * Gets an idle Robominer from the pool.
  */
  Robominer* RobotPool::getMiner()
  {
  