docs(src/assets/): update pip official documentation

Author: KemingHe

src/assets/pip/_metadata.json

@@ -1,6 +1,6 @@
 {
   "source_repo": "pypa/pip",
   "docs_path": "docs",
-  "updated_at": "2025-08-26T22:04:38Z",
+  "updated_at": "2025-09-02T22:04:32Z",
   "commit_sha": "f49a2d9fcdbee4609910f724a4144f8860e9285f"
 }