fix cuda toolkit URL
@@ -13,7 +13,7 @@ These components must be installed to use CuPy:
* `NVIDIA CUDA GPU <https://developer.nvidia.com/cuda-gpus>`_ with the Compute Capability 3.0 or larger.
-* `CUDA Toolkit <https://developer.nvidia.com/cuda-zone>`_: v9.0 / v9.2 / v10.0 / v10.1 / v10.2 / v11.0
+* `CUDA Toolkit <https://developer.nvidia.com/cuda-toolkit>`_: v9.0 / v9.2 / v10.0 / v10.1 / v10.2 / v11.0
* If you have multiple versions of CUDA Toolkit installed, CuPy will automatically choose one of the CUDA installations.
See :ref:`install_cuda` for details.
