add url tip

Author: Mikachu2333

src/recipe/lang/Python/common.h

@@ -19,6 +19,7 @@ pl_python_speed_url_constructor (const char *url, const char *user_data)
   char *str = xy_str_delete_suffix (url, "/simple");
   str = xy_2strcat (str, "/packages/fa/80/eb88edc2e2b11cd2dd2e56f1c80b5784d11d6e6b7f04a1145df64df40065/opencv_python-4.12.0.88-cp37-abi3-win_amd64.whl");
   if (strstr (url, "mirror.sjtu.edu.cn"))
+    // e.g. https://mirror.sjtu.edu.cn/pypi-packages/fa/80/eb88edc2e2b11cd2dd2e56f1c80b5784d11d6e6b7f04a1145df64df40065/opencv_python-4.12.0.88-cp37-abi3-win_amd64.whl
     str = xy_str_gsub (str, "pypi-packages/packages", "pypi-packages");// 针对 Sjtug
 
   return str;