docs: point VSAG dependency to DataSys

Author: shuhao

.gitmodules

@@ -16,5 +16,5 @@
 	branch = master
 [submodule "algorithms_impl/vsag"]
 	path = algorithms_impl/vsag
-	url = https://github.com/intellistream/vasg.git
+	url = https://github.com/DataSysResearch/vasg.git
 	branch = main

README.md

@@ -109,7 +109,7 @@ DATASETS['mydataset'] = lambda: MyDataset()
 | faiss_HNSW_Optimized | Graph index | HNSW with Gorder optimization |
 | faiss_IVFPQ | Quantization | Inverted file + product quantization |
 | diskann | Graph index | DiskANN |
-| vsag_hnsw | Graph index | VSAG HNSW |
+| vsag_hnsw | Graph index | [DataSys-maintained VSAG derivative](https://github.com/DataSysResearch/vasg) |
 
 ### Add a new algorithm
 

README.zh-CN.md

@@ -86,7 +86,7 @@ DATASETS['mydataset'] = lambda: MyDataset()
 | faiss_HNSW_Optimized | 图索引 | 支持 Gorder 优化的 HNSW |
 | faiss_IVFPQ | 量化 | 倒排文件 + 乘积量化 |
 | diskann | 图索引 | DiskANN |
-| vsag_hnsw | 图索引 | VSAG HNSW |
+| vsag_hnsw | 图索引 | [DataSys 维护的 VSAG 定制版本](https://github.com/DataSysResearch/vasg) |
 
 ### 添加新算法