Fix command path in docs

[awkrail]

Currently, train_caption_coco_large.sh is not located on run_scripts/lavis/blip/... but run_scripts/blip/.... I found 4 cases hits, so fixed them.

awkrail@taichi-nishimuranoMacBook-Pro docs % ag "run_scripts/lavis"
tutorial.training-example.rst
10:    bash run_scripts/lavis/blip/train/train_caption_coco_large.sh

tutorial.configs.rst
11:    bash run_scripts/lavis/blip/train/train_retrieval_coco.sh

tutorial.evaluation.rst
34:    bash run_scripts/lavis/blip/eval/eval_coco_cap.sh
40:    bash run_scripts/lavis/blip/eval/eval_coco_cap_large.sh