[Cython] Broken link to CEP 516

[Stefan Behnel]

Jeroen Demeyer schrieb am 21.05.2015 um 14:21:
> http://docs.cython.org/src/reference/compilation.html#compiler-directives
> there are two links to "CEP 516" but they are broken.

Thanks. The problem seems to be an incorrect redirect to
"github.../wikienhancements/" instead of "github.../wiki/enhancements/".

I don't know how the setup is done here, but Robert should know.

Stefan