Improve code quality: auto-pr/docstrings-1780792152

Author: auto-pr-bot

code/volumn_codes/vol1/ch00/setup-linux.cpp

@@ -1,7 +1,8 @@
-#include <iostream>
-
-int main()
-{
-    std::cout << "Hello, Modern C++!" << std::endl;
-    return 0;
-}
+#include <iostream>
+
+// 程序入口，输出问候消息
+int main()
+{
+    std::cout << "Hello, Modern C++!" << std::endl;
+    return 0;
+}