[docs] Add warning on pure_localization submap resolutions (#858)
[docs] Add warning on pure_localization submap resolutions (#858)

Closes #847
wohe/cartographer_ros,cartographer-project/cartographer_ros,cartographer-project/cartographer_ros,damonkohler/cartographer_ros,wohe/cartographer_ros,cartographer-project/cartographer_ros,googlecartographer/cartographer_ros,googlecartographer/cartographer_ros,googlecartographer/cartographer_ros,wohe/cartographer_ros,damonkohler/cartographer_ros,damonkohler/cartographer_ros