Fix an issue with the 6.7B path (#712)

Author: Binh Tang

projects/OPT/README.md

@@ -10,6 +10,7 @@ For notes regarding the development of all these models, please refer to our [ch
 | OPT-350M | 350M| [part0](https://dl.fbaipublicfiles.com/opt/v1_20220502/350m/reshard.pt) |
 | OPT-1.3B | 1.3B | [part0](https://dl.fbaipublicfiles.com/opt/v1_20230405/1.3b/reshard-model_part-0.pt) |
 | OPT-2.7B | 2.7B | [part0](https://dl.fbaipublicfiles.com/opt/v1_20230405/2.7b/reshard-model_part-0.pt) |
+| OPT-6.7B | 6.7B | [part0](https://dl.fbaipublicfiles.com/opt/v1_20230405/6.7b/reshard-model_part-0.pt) |
 | OPT-13B | 13B | [part0](https://dl.fbaipublicfiles.com/opt/v1_20230405/13b/reshard-model_part-0.pt), [part1](https://dl.fbaipublicfiles.com/opt/v1_20230405/13b/reshard-model_part-1.pt) |
 | OPT-30B | 30B | [part0](https://dl.fbaipublicfiles.com/opt/v1_20230405/30b/reshard-model_part-0.pt), [part1](https://dl.fbaipublicfiles.com/opt/v1_20230405/30b/reshard-model_part-1.pt), [part2](https://dl.fbaipublicfiles.com/opt/v1_20230405/30b/reshard-model_part-2.pt), [part3](https://dl.fbaipublicfiles.com/opt/v1_20230405/30b/reshard-model_part-3.pt) |
 | OPT-66B | 66B | [part0](https://dl.fbaipublicfiles.com/opt/v1_20230405/66b/reshard-model_part-0.pt), [part1](https://dl.fbaipublicfiles.com/opt/v1_20230405/66b/reshard-model_part-1.pt), [part2](https://dl.fbaipublicfiles.com/opt/v1_20230405/66b/reshard-model_part-2.pt), [part3](https://dl.fbaipublicfiles.com/opt/v1_20230405/66b/reshard-model_part-3.pt), [part4](https://dl.fbaipublicfiles.com/opt/v1_20230405/66b/reshard-model_part-4.pt), [part5](https://dl.fbaipublicfiles.com/opt/v1_20230405/66b/reshard-model_part-5.pt), [part6](https://dl.fbaipublicfiles.com/opt/v1_20230405/66b/reshard-model_part-6.pt), [part7](https://dl.fbaipublicfiles.com/opt/v1_20230405/66b/reshard-model_part-7.pt) |