Fix Hashlink gcc command

Author: yuxiaomao

Diff for: HashLink.md

@@ -70,7 +70,8 @@ Alternatively, you can compile for hl/c, and then compile C files with a C compi
 If you're using GCC, you can build with:
 
 ```
-gcc -O3 -o myapp -std=c11 -I out out/main.c -lhl -lheaps.hdll -lui.hdll -lfmt.hdll [-L/path/to/required/hdll]
+cd bin
+gcc -O3 -o mygame -std=c11 -I hlcout hlcout/game.c -lhl -lheaps.hdll -lui.hdll -lfmt.hdll [-L/path/to/required/hdll]
 ```
 
 For template, see also [Hashlink#706](https://github.com/HaxeFoundation/hashlink/pull/706).