Update README.md

Former-commit-id: 13f139d86722f10ee28f6c34959d16867945cc67

README.md

@@ -120,7 +120,7 @@ The training data consists of 4 types of data:
 
 3. Referring segmentation datasets: [refCOCO](https://web.archive.org/web/20220413011718/https://bvisionweb1.cs.unc.edu/licheng/referit/data/refcoco.zip), [refCOCO+](https://web.archive.org/web/20220413011656/https://bvisionweb1.cs.unc.edu/licheng/referit/data/refcoco+.zip), [refCOCOg](https://web.archive.org/web/20220413012904/https://bvisionweb1.cs.unc.edu/licheng/referit/data/refcocog.zip), [refCLEF](https://web.archive.org/web/20220413011817/https://bvisionweb1.cs.unc.edu/licheng/referit/data/refclef.zip) ([saiapr_tc-12](https://web.archive.org/web/20220515000000/http://bvisionweb1.cs.unc.edu/licheng/referit/data/images/saiapr_tc-12.zip)) 
 
-    Note: the origianl links of refCOCO series data are down, and we update them with new ones
+    Note: the original links of refCOCO series data are down, and we update them with new ones. If the download speed is super slow or unstable, we also provide a [OneDrive link](https://mycuhk-my.sharepoint.com/:f:/g/personal/1155154502_link_cuhk_edu_hk/Em5yELVBvfREodKC94nOFLoBLro_LPxsOxNV44PHRWgLcA?e=zQPjsc) to download. **You must also follow the rules that the original datasets require.**
 
 4. Visual Question Answering dataset: [LLaVA-Instruct-150k](https://huggingface.co/datasets/liuhaotian/LLaVA-Instruct-150K/blob/main/llava_instruct_150k.json)