Fixed the link in master.
> On Dec 17, 2018, at 5:15 AM, Mark Adams via petsc-dev <petsc-dev at mcs.anl.gov> wrote:
> 
> The GPU web page looks like it is 8 years old ... this link is dead (but ex47cu seems to be in the repo):
> 
> 	• Example that uses CUDA directly in the user function evaluation
> Thanks,
> Mark