Sample dependencies GL link broken

Lots of sample READMEs dependency sections (e.g. [this one](https://github.com/NVIDIA/cuda-samples/tree/master/Samples/2_Concepts_and_Techniques/particles)) points to [a dead link](https://github.com/NVIDIA/cuda-samples/blob/master/README.md#gl) ; did you mean #OpenGL (which would be strange because it is said to be provided by the cuda driver), #GLFW or something else ?