DOC: link in User Guide should be redirected

### Issue with current documentation:

In [NumPy user guide](https://github.com/numpy/numpy/blob/eb6e299b243319b9fa8ff68ececa3d14eafe9a08/doc/source/user/index.rst), "NumPy tutorials" opens NumPy Features.

### Idea or request for content:

The correct link should be https://numpy.org/numpy-tutorials/