Added source links to detr_r50_300epochs.sh file in README.md

The experiment column details various DETR training configurations using shell scripts `detr_r50_300epochs.sh` and `detr_r50_500epochs.sh` . The source links are added to these files.

official/projects/detr/README.md

@@ -19,8 +19,8 @@ detr/experiments.
 
 | Model     | Resolution | Batch size | Epochs | Decay@ | Params (M) | Box AP | Dashboard | Checkpoint | Experiment |
 | --------- | :--------: | ----------:| ------:| -----: | ---------: | -----: | --------: | ---------: | ---------: |
-| DETR-ResNet-50 | 1333x1333 |64|300| 200 |41 | 40.6 | [tensorboard](https://tensorboard.dev/experiment/o2IEZnniRYu6pqViBeopIg/#scalars) | [ckpt](https://storage.googleapis.com/tf_model_garden/vision/detr/detr_resnet_50_300.tar.gz) | detr_r50_300epochs.sh |
-| DETR-ResNet-50 | 1333x1333 |64|500| 400 |41 | 42.0| [tensorboard](https://tensorboard.dev/experiment/YFMDKpESR4yjocPh5HgfRw/) | [ckpt](https://storage.googleapis.com/tf_model_garden/vision/detr/detr_resnet_50_500.tar.gz) | detr_r50_500epochs.sh |
+| DETR-ResNet-50 | 1333x1333 |64|300| 200 |41 | 40.6 | [tensorboard](https://tensorboard.dev/experiment/o2IEZnniRYu6pqViBeopIg/#scalars) | [ckpt](https://storage.googleapis.com/tf_model_garden/vision/detr/detr_resnet_50_300.tar.gz) | [detr_r50_300epochs.sh](https://github.com/tensorflow/models/blob/master/official/projects/detr/experiments/detr_r50_300epochs.sh) |
+| DETR-ResNet-50 | 1333x1333 |64|500| 400 |41 | 42.0| [tensorboard](https://tensorboard.dev/experiment/YFMDKpESR4yjocPh5HgfRw/) | [ckpt](https://storage.googleapis.com/tf_model_garden/vision/detr/detr_resnet_50_500.tar.gz) | [detr_r50_500epochs.sh](https://github.com/tensorflow/models/blob/master/official/projects/detr/experiments/detr_r50_500epochs.sh) |
 | DETR-ResNet-50 | 1333x1333 |64|300| 200 |41 | 40.6 | paper | NA | NA |
 | DETR-ResNet-50 | 1333x1333 |64|500| 400 |41 | 42.0 | paper | NA | NA |
 | DETR-DC5-ResNet-50 | 1333x1333 |64|500| 400 |41 | 43.3 | paper | NA | NA |