Fixing links in README

README.md

 # Optimized operators for [HyTeG](https://i10git.cs.fau.de/hyteg/hyteg)
 
 This repository contains optimized elementwise operators for [HyTeG](https://i10git.cs.fau.de/hyteg/hyteg).
-The code under [operators](operators) is generated using [HFG](https://i10git.cs.fau.de/terraneo/hyteg-form-generator).
+The code under [operators](operators) is generated using the [HOG](https://i10git.cs.fau.de/hyteg/hog).
 Each kernel has a platform independent and, where applicable, an AVX-vectorized version.
 The desired variant is configured in CMake.